Look for a program written in J2ME, it's the mobile format that works on most of the PDA-type phones. That, and Cingular has the E62 now that would run something like that, (it currently runs Office documents like Excel), and an easy to use keyboard.
Just my .02
Oh, and look for a quad-band phone. That way, you could get a prepaid SIM and use it worldwide (including Iraq, Afghanistan, and all the other popular AF vacation spots nowadays).