I had the chance to play around with one of these last night and it's a really nice device. The HP Ipaq 900 is a Windows Mobile 6.1 device with tri-band UMTS/HSDPA and quad-band GSM/GPRS/EDGE. It has built in GPS and a 3 Mega-Pixel Camera.
The device will be available Worldwide - starting shipping June 30th!
You can get more details HERE