Portable retro gaming! I use my Pocket PC quite a bit for games, mainly old NES titles on the PocketNester emulator. But the hardware buttons on the iPAQ are too small, and it can be hard to use certain combinations. My solution for this was to interface an original Nintendo controller to my PPC. For this mod, I used a cheap IR keyboard (Belkin F8U1500) and wired the directional keys and PPC hardware buttons (circled below) directly to the NES. Link.
Make a NES Pad work with a Pocket PC