Here's a list of ROM image names which I've managed to get to work sucessfully on the iPAQ. Bubble bobble and Pacland are both a bit slow, but the rest are pretty cool.
To get around the need to jump and move at the same time in games like Black Tiger, I remapped the keys so that moving left, right, etc fires on a single tap and moves if you hold down the direction. That leaves the "press in the dpad" allocation free for jump, making these games playable !
I'm looking for the filenames for known iPAQ-friendly versions of PacMan, Ms PacMan, any more recent ('83 onwards) shooters and any real "must haves" I've overlooked... feel free to follow up with any you know of !
Anyway, here's the list: