I just got in my new XV6600 Windows Mobile Smart Phone a few days ago. I downgraded/upgraded from a Dell X50v but I think it was the best choice. I made the switch because I wasn't using my PDA as much as I needed so I though this would force it on me, plus I love new gadgets.
I also got a Sony HBH-660 bluetooth headset. There were two things that really sold me on this. 1) You look a little ridiculous holding a PDA to your head. 2) It has a caller id screen so I don't have to pull out my PDA to see who is calling.
