This is all you need. I just got mine yesterday (had the Treo 600 before it). If you've never seen one of these phones, it's amazing how much is crammed into such a small device. The full QWERTY keyboard also works amazingly well. And you actually talk into it like any normal phone; no N-Gage Sidetalking crap here.
With the 650, you get:
-Bluetooth
-320x320 color screen (looks amazing compared to the 600)
-Full web access to virtually any site
-Speakerphone
-E-mail
-Messaging (You can also download apps like AOL IM and instant message for FREE)
-digital camera
-video capture (not the greatest, but still cool)
-Built-in MP3 playback (I'd buy Pockettunes anyway, however)(You can also use apps to have MP3s as ringtones or to take the place of any other alarm/alert on the phone)
-Access to thousands of Palm OS5 apps
You can also view movie files with various programs like MMPlayer. I don't use this feature as much anymore now that I have a PSP, but the 650's screen is so clear and sharp, that I have no problem watching subtitled anime on a picture half the size of the screen (letterbox).
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
You will need to buy an SD card to put any large files onto the phone, and to store more than a few MP3s. Palmone will send you a free 128mb card when you purchase the phone from any retailer. I'd recommend a 512 or 1gb card though.
More info here:
http://palmone.com/us/products/smartphones/
Also this board is great for anything Treo:
http://www.treocentral.com
And for gaming, screw those shitty cell phone games. The Treo's d-pad works great and the button layout works perfectly the NES, Game Gear/Master System, GB/GBC, and TG-16 emulators available for it among others. With the Treo's 320x320 screen, all the games supported look and run perfectly; on the Treo 600, NES games were often hard to see (reading text was impossible) and were never 100% smooth, but on the 650, it's all perfect.
Just make sure to get insurance on a phone like this. My 600 died on me and the warranty, for one year, was expired. Luckily AMEX extends the warranty by another year, so we got the money for the phone from them. I use Sprint, and for $5 a month, they will replace the phone should anything happen to it. (The 600, I found out, is NOTORIOUS for fucking up and has a major problem with the battery. I didn't have anything happen until a few weeks ago and owned it since November 2003. The 650 fixes all the flaws the 600 had anyway. I'm not seeing complaints about it messing up like I did with the Treo 600 weeks after it was first released!)
IMO the reason the 650 was even released so quickly after the 600 was to fix all the flaws the 600 had. It's not a huge upgrade over the 600 (the main difference is the higher resolution screen, bluetooth support, and the 650 is more than twice as fast as the 600) The big 600 problem involved the battery messing up the phone after a time, and without a kit, it's hard to remove the battery, the warranty is voided, etc. The 650's battery is easily replaced and pops right out.