Stick Tennis. This is what I spent a lot of the closed season working on (I was only one small part of it - characters & animation). It's by far the best game I've ever worked on. Making games normally puts me off playing them, but this one breaks the rule.
So if you've got an iPhone I think it's a great way to waste time between runs (and I'm not a tennis fan).
This isn't an advert, I don't get royalties, just rather pleased with it. Plus the game is free!