I just picked up a Palm PRO. It's basically an updated Treo in an iPhone form-factor (much slimmer than the Treo 750 it replaced). Great phone so far, especially if you prefer an NON-slide out keyboard, and the Windows Mobile platform (this one came with WM 6.1). I believe it's also their first completely "unlocked" phone and works with any GSM network. I have ATT, and just popped in my SIM card and was good to go. It's got all the normal Treo smart-phone/Windows Mobile bells and whistles, as well as wi-fi, GPS, 3G, etc...
http://www.palm.com/us/products/phones/treopro/