I think Blockoban would make a great iPhone game... I'm quite rubbish at it, but it is one of those games that you can just pick up and play when you're bored, and easily stop if you have to.
sound on / off added (burfy's feedback).
16 official levels now. All levels are great. I must say I'm a big fan of Psychotronic's levels (thx Psycho). When a level is "only" accepted, it doesn't mean it will not be official one day, it's just I'm not sure for now.