Since I'm such a big fan of Pocket PC's in general I spend a lot of time goofing around with them. One thing I naturally like to do is play games on them. Sean O'Connor (across the ocean in England) develops some pretty neat games for the Pocket PC and you can get trial versions of them from his web site: http://www.windowsgames.co.uk/index.html
The two games I've been playing in spare moments while waiting in line, etc. recently have been Pocket Slay and Pocket Conquest.
Those of you who've attended my Code Camp sessions may remember Sean O'Connor for another reason - he also makes a nifty Pocket PC Setup Creator which you can find out about here: http://www.windowsgames.co.uk/PocketSetupCreator.html