I just got a AudioVox 5600 last week (Cingular). Not quite as big as XV 6600. No keyboard. Runs Windows Mobile. Does camera, movies, voice recordings, email, internet connection, bluetooth, etc., etc. I just downloaded a map from Streets and Trips into it. Darn nifty!
I'm probably going to sell my iPaq because it is much bigger than my cell phone and I don't want to carry around two devices.