Dwinget, Tungstenlover and Moose man have all recommended it, and I'll agree with them. The Palm Tungsten T3 is without a doubt one fo the best PDAs around today.
My reasons are as follows...
1. I'd go with Palm over Treo for the simple reason that IMHO, there exists better software for Palm than for Treo. Although they're both supposed to be sharing the same platform, a lot of programs Ive used dont have Treo support.
2. The Tungsten T3 screen is probably one of the best screens available today. I work for a tech firm, and handle their business development, and I frequently need to carry documents with me in PDF, Word, and Excel. The T3 displays them all flawlessly. My colleagues HP iPaq 1945 doesnt even come close.
The virtual silk-screen and full-sceen graffiti make text input a breeze. I havent had the need for a keyboard yet, but there are a ton of them available that work with the T3, and some of them connect to the T3 wirelessly.
3. Sure, the battery life could be better, but with some moderate usage, I can squeeze abt 3-1/2 days of juice out of the T3, no sweat.
4. Ive used it to connect to the net to research on the fly, and check my mail. I did this by using the bluetooth to sync it to my Nokia 8910 with GPRS, and then the Sony-E T610 that i replaced with Nokia with. Both BT connections were extremely stable.
5. Mp3s galore
6. Man, this thing is fast. Ive switched between applications like I was on crack cocaine, and the T3 took it all with aplomb.
7. This thing is tough. Ive accidentally dropped it once, onto a concrete floor, and the thing didnt even have a scratch on it. Mind you, early users of the T3 (and I'm one of them, but ive had no problems) have complained that the digitizer stops working, the screws holding the slider in place fall out (although this doesnt seem to affect the slider in any way)
8. After palm fixed the initial bug with the SD cards, the storage you can get with the SD cards is more than adequate. (I'm currently using 512 MB)
Hope this helps.