Many thanks to all of you for your hard work in helping create this list, in particular Sentry for helping with a general tidy up/refresh of the app listings. If you have any recommendations please just mention them in this thread, thank you.
Best camera app - iOS 5 Camera app (stock)
HDR shots, easy access from the lock screen and the sheer quickness in which photos are added to your camera roll should make this your go to camera app.
Honourable mention: Camera+ ($0.99). Exposure and focus controls, image stabiliser, improved digital zoom and dozens of optional effects make Camera+ a solid choice.
Best photo sharing app - Instagram (free)
Offers an incredibly simple and intuitive interface for viewing photos and sharing your own. Also includes a wealth of filters, effects and borders to make your photos look just right before sharing to any of the web's most popular photo viewing sites.
Best panoramic photos - Photosynth (free)
This app, developed by Microsoft, makes it incredibly easy to take (and share) stunning panoramic photos. Makes great use of Bing maps to share your panoramas, and view other people's.
Honourable mention: 360 Panorama ($0.99). Similar to Photosynth, but has vastly improved sharing options, and quicker photo stitching.
Best photo editor - Snapspeed ($4.99)
Absolutely packed with effects and features, accessed by a superb touch interface with intuitive gestures.
Honourable mention: Camera+ ($0.99).
Best web browser - Grazing ($1.99)
Grazing adds a lot to your browsing experience, including tabs, adblock, full screen mode, intuitive gestures, better integration and smart searches. The interface is simply incredible, a real step above the alternatives.
Best news/RSS reader - Reeder ($2.99). A very robust, traditional and familiar interface to view your news feeds, packed full of features.
Honourable mention - Feedly (free) An elegant and minimalist feed reader with a very intuitive interface, packed full of features and excellent sharing features.
Best offline web viewing - Instapaper ($4.99)
Allows you to save pages for later reading. Also offers a much improved interface for reading those articles (similar to Reader in Safari) which looks especially great on iPad.
Best Wikipedia viewing -Wikipanion (free, upgradable to $4.99 version)
Allows offline storage of visited or saved Wikipedia pages, with advanced bookmark management, clean UI and viewing.
Honourable mention - Wiki Offline (free, upgradable to $9.99 version)
Lets you browse through a large amount of Wikipedia pages offline.
Best NeoGAF app - Secondapps (web)
Not strictly an app, but if you're new to iOS this should be one of the first things you put onto your homescreen. Navigate to http://secondapps.com/neogaf/ then hit the action button at the bottom of Safari, then 'add to home screen'. The best implementation of forum software I've ever seen.
Best social network app - Flipboard (free, iPad only)
Takes your Twitter, Facebook, and a lot of popular RSS feeds, and makes them into your own personal interactive magazine. Excellent presentation, and dynamically resizes images/articles to take up more or less space according to importance. It's really something to behold.
Best messaging app - iMessage (stock)
One of the killer features of iOS5 lets you send messages directly to other iOS users with some great features packed in, including delivery reports, free picture messaging and bypasses your mobile plans SMS limits.
Honourable mention: WhatsApp($0.99). A great alternative to iMessage if you need to send messages and photos directly to non iOS users. Cross platform compatability and group chat set this apart from iMessage.
Best IM client - IM+ Pro ($4.99)
Fantastic interface, packed full of features and incredibly robust. Free version also available.
Honourable mention: imo IM (Free) A decent IM app that supports all of the main chat protocols, but is lacking some functionality.
Best Twitter app - Tweetbot ($2.99)
Absolutely packed with features all tucked nicely behind a stunning and incredibly easy to use interface. Also has timeline syncing using Tweetmark.
Honourable mentions: Twitter official (free). A great option if you just want a free Twitter client. Echofon (free) if you want to sync your timelines between multiple devices.
Best digital radio app - TuneIn Radio ($0.99)
Incredible interface for listening to over 50,000 radio stations around the world. Also has great support for podcasts, lets you control and record audio playback, and dozens of other incredible features.
Best streaming music - Pandora (free)
A brilliant tool that lets you listened to personalised radio stations. Just start with the name of your favourite song or artist, and Spotify will start to build a radio station that's completely unique to your tastes.
Honourable mention: Spotify ($10 p/m). Instant access to over 15 million tracks straight from your phone, also allows you to listen offline, and share your playlists.
Best video player - Air Video ($2.99)
Allows you to quickly and easily stream pretty much any video format straight to your iPad/iPhone, as well as viewing and sorting options. HD quality over WiFi and 3G.
Honourable mention: Video Stream ($2.99).
Best notes app - Evernote (free)
Allows you to quickly and easily take notes in regular text, picture or audio format. Seamlessly syncs with the desktop and web versions, as well as other applications (such as AwesomeNote etc)
Best calendar app - Week Calenadar ($1.99)
Great interface for viewing and editing your calendar. Includes new ways to view the calendar and events, gestures, and automatic icon/colour assignments.
Best document management - GoodReader (iPhone, iPad $4.99)
A great tool for viewing a huge range of documents on your iOS device, including audio files, movies, documents, text files, books, maps and pictures. Also offers some impressive annotation and file/folder management features.
Best remote desktop control - Splashtop Remote Desktop ($0.99 iPhone, $1.99 iPad)
Honourable mention: LogMeIn ($29.99). Very pricey, but allows you to control multiple machines on just a free LogMeIn subscription. Has a superb interface.
Best turn-by-turn GPS - Waze (free)
A superb free traffic and navigation app, including turn-by-turn directions, test to speech capabilities and many social features such as live community driven traffic information and road reports.
Best flashlight app - LED Light (free)
Quick access to the LED flash, SOS and strobe light modes included through a nice and simple UI.
Thank you very much for Jedeye in his hard work in creating NeoGAF's best games on iOS.[/code]
Photography
Best camera app - iOS 5 Camera app (stock)
HDR shots, easy access from the lock screen and the sheer quickness in which photos are added to your camera roll should make this your go to camera app.
Honourable mention: Camera+ ($0.99). Exposure and focus controls, image stabiliser, improved digital zoom and dozens of optional effects make Camera+ a solid choice.
Best photo sharing app - Instagram (free)
Offers an incredibly simple and intuitive interface for viewing photos and sharing your own. Also includes a wealth of filters, effects and borders to make your photos look just right before sharing to any of the web's most popular photo viewing sites.
Best panoramic photos - Photosynth (free)
This app, developed by Microsoft, makes it incredibly easy to take (and share) stunning panoramic photos. Makes great use of Bing maps to share your panoramas, and view other people's.
Honourable mention: 360 Panorama ($0.99). Similar to Photosynth, but has vastly improved sharing options, and quicker photo stitching.
Best photo editor - Snapspeed ($4.99)
Absolutely packed with effects and features, accessed by a superb touch interface with intuitive gestures.
Honourable mention: Camera+ ($0.99).
Internet
Best web browser - Grazing ($1.99)
Grazing adds a lot to your browsing experience, including tabs, adblock, full screen mode, intuitive gestures, better integration and smart searches. The interface is simply incredible, a real step above the alternatives.
Best news/RSS reader - Reeder ($2.99). A very robust, traditional and familiar interface to view your news feeds, packed full of features.
Honourable mention - Feedly (free) An elegant and minimalist feed reader with a very intuitive interface, packed full of features and excellent sharing features.
Best offline web viewing - Instapaper ($4.99)
Allows you to save pages for later reading. Also offers a much improved interface for reading those articles (similar to Reader in Safari) which looks especially great on iPad.
Best Wikipedia viewing -Wikipanion (free, upgradable to $4.99 version)
Allows offline storage of visited or saved Wikipedia pages, with advanced bookmark management, clean UI and viewing.
Honourable mention - Wiki Offline (free, upgradable to $9.99 version)
Lets you browse through a large amount of Wikipedia pages offline.
Best NeoGAF app - Secondapps (web)
Not strictly an app, but if you're new to iOS this should be one of the first things you put onto your homescreen. Navigate to http://secondapps.com/neogaf/ then hit the action button at the bottom of Safari, then 'add to home screen'. The best implementation of forum software I've ever seen.
Social
Best social network app - Flipboard (free, iPad only)
Takes your Twitter, Facebook, and a lot of popular RSS feeds, and makes them into your own personal interactive magazine. Excellent presentation, and dynamically resizes images/articles to take up more or less space according to importance. It's really something to behold.
Best messaging app - iMessage (stock)
One of the killer features of iOS5 lets you send messages directly to other iOS users with some great features packed in, including delivery reports, free picture messaging and bypasses your mobile plans SMS limits.
Honourable mention: WhatsApp($0.99). A great alternative to iMessage if you need to send messages and photos directly to non iOS users. Cross platform compatability and group chat set this apart from iMessage.
Best IM client - IM+ Pro ($4.99)
Fantastic interface, packed full of features and incredibly robust. Free version also available.
Honourable mention: imo IM (Free) A decent IM app that supports all of the main chat protocols, but is lacking some functionality.
Best Twitter app - Tweetbot ($2.99)
Absolutely packed with features all tucked nicely behind a stunning and incredibly easy to use interface. Also has timeline syncing using Tweetmark.
Honourable mentions: Twitter official (free). A great option if you just want a free Twitter client. Echofon (free) if you want to sync your timelines between multiple devices.
Music and Video
Best digital radio app - TuneIn Radio ($0.99)
Incredible interface for listening to over 50,000 radio stations around the world. Also has great support for podcasts, lets you control and record audio playback, and dozens of other incredible features.
Best streaming music - Pandora (free)
A brilliant tool that lets you listened to personalised radio stations. Just start with the name of your favourite song or artist, and Spotify will start to build a radio station that's completely unique to your tastes.
Honourable mention: Spotify ($10 p/m). Instant access to over 15 million tracks straight from your phone, also allows you to listen offline, and share your playlists.
Best video player - Air Video ($2.99)
Allows you to quickly and easily stream pretty much any video format straight to your iPad/iPhone, as well as viewing and sorting options. HD quality over WiFi and 3G.
Honourable mention: Video Stream ($2.99).
Other
Best notes app - Evernote (free)
Allows you to quickly and easily take notes in regular text, picture or audio format. Seamlessly syncs with the desktop and web versions, as well as other applications (such as AwesomeNote etc)
Best calendar app - Week Calenadar ($1.99)
Great interface for viewing and editing your calendar. Includes new ways to view the calendar and events, gestures, and automatic icon/colour assignments.
Best document management - GoodReader (iPhone, iPad $4.99)
A great tool for viewing a huge range of documents on your iOS device, including audio files, movies, documents, text files, books, maps and pictures. Also offers some impressive annotation and file/folder management features.
Best remote desktop control - Splashtop Remote Desktop ($0.99 iPhone, $1.99 iPad)
Honourable mention: LogMeIn ($29.99). Very pricey, but allows you to control multiple machines on just a free LogMeIn subscription. Has a superb interface.
Best turn-by-turn GPS - Waze (free)
A superb free traffic and navigation app, including turn-by-turn directions, test to speech capabilities and many social features such as live community driven traffic information and road reports.
Best flashlight app - LED Light (free)
Quick access to the LED flash, SOS and strobe light modes included through a nice and simple UI.
Games
Thank you very much for Jedeye in his hard work in creating NeoGAF's best games on iOS.[/code]