It depends on what types of video games you like in general. If you like RPGs, I would suggest Arvale: Short Tales (or any other Arvale game). If you like 1st person shooters, there's a mobile version of Call of Duty. If you like games based on board games, I believe Handmark (I think) has a bundle of popular board games. Even if you don't like any native pocket pc games, you could always try an emulator. There's ones for the snes, the gameboy (plain or color), the gameboy advanced, and much more. For emulators, try a search on aximsite or a google search. For pocket pc games you could try
PocketGear.com or look at the list of free games here on aximsite. Since you have an X50v, you might want to look for (I think) a 3d accelerator version (if one exists). Does this help you?