Incidentally which ipod games do people have? I seem to be in the process of collecting a full set ;)
I have:
Bomberman: a good clone of the original and very fun, but the keys usually end up accidentally stop playing whatever it is I'm listening to simultaneously so I end up only playing it if I don't want to catch up on podcasts - this is rare
Brain Challenge: sort of a brain training thing. Well implemented and fun. There's reports on the comments that for some people it crashes frequently but (touch wood) hasn't for me so far.
Naval Battle: a battleship clone but you get special attacks and is actually extremely well done. Great to kill a few minutes while waiting for something else.
Peggle: pure addiction. Play this ALL the time, wonderful game.
Phase: just bought on the basis of this thread - am enjoying it, is fun. But again, tend to play it on a separate "I want to play" session rather than while I'm listening to something else for obvious reasons.
Sonic the Hedgehog: a good idea at the time buy. In reality the controls are horribly difficult to use on such a tiny wheel and I rarely play it.
Yahtzee: a fairly good port. Fun, but not earth shattering - still nice to have in the game playing arsenal...