How possible would it be to code a GBA or GBC Emu for the Palm or a PocketPC. Cuz thats a perfect system to play handheld roms on! Space would be the only concern, but with a memory card, it wont be a problem.
It is possible, because they already exist. There seems to be more emulators for PocketPC than Palm though, covering a variety of systems including the Gameboy. Check out the selection at Zophar.