Some general thoughts on my part:
Dashboard:
Compared to Konfabulator... I don't know. I still feel like Dashboard has yet to really become completely intigrated into the OS like it will be in the next few months. There are some nice, useful widgets available at launch... but I am sure there will be plenty more that will make our favorite app more useful. That said, I am a bit disappointed. I was hoping that it would NOT be stand alone app that I would have to actually "load" everytime I wanted to view a widget. Having it running constantly on my desktop would have been ideal... but for those of us who do not have F12 set as our eject button do get to enjoy a simple push of the button to see our widgets. A small gripe... but a gripe none-the-less. I've also run into a couple of problems of loading other widgets... I've clicked on certain widgets in the widgets bar only to find that dashboard "minimizes." Upon bringing it back up I found that a widget I had open had now closed and erased my info that I had entered. Could have been the widget's fault... I don't know.
Spotlight:
Fast. Sleek. Effective. Not only is it great to have everything simply broken down for you by application type (mail, photo, docs, etc.) but the fact that it also "reads" all your documents is going to be a big help (imagine if this thing read .pdfs! Ah well!) I heard some complaints about the hotkey being Apple+Space... but I don't see the problem especially since the hotkeys are customizable. I haven't had a real use, yet, for Spotlight... but I know I will and it will change the way we search for stuff on our computers forever. This will be standard on all OSes for the rest of our lives.
OS's speed:
There is a slight speed jump. I've heard similar on many fronts... it runs slightly smoother than Panther did. This really isn't a terribly big deal, however, I do take some happiness in knowing that this OS is "better" than the last one in the speed category... know what I mean? It's not noticable on all fronts... but it just seems like everything is responding a tad quicker. Just good to know.
QT7:
Not really a Tiger observation... but I'm a tad miffed. Running a 12" PB G4... I got gipped The new codec (designed specifically with HD playback in mind) was not designed with G4s in mind. That being said, after having tried to watch both the Fantastic 4 and Batman trailers in high def with QT7... it was choppy and, overall, unviewable. It's disappointing... but I am sure those of you running a G5 with a nice screen will be able to appreciate just precisely what this program (and codec) was created for.
I've only had a few hours with it... but I am enjoying it. I'm fairly new to the world of RSS and I really would like to get into it before I comment on the RSS capablities of Safari. I was on ESPN and the RSS feed did pop up... I clicked it right away and the ability to see, exactly, what news articles were available to me was a major plus. Again, I need to play around with it some more... but I like it.
There is PLENTY that I am missing... If anyone has found any websites that make Tiger better (friend of mine found a website that has a prog that makes Mail look a little more attractive... I don't know the site but once I do... I'll post it) please so supply the links for the sites.