If you are looking for a new, free iPhone game, check out Mafia Wars by Zynga. It is also available on other platforms (i.e. Facebook, My Yahoo!, and MySpace) but I have only played it on the iPhone with some persuasion. It seems to have a pretty big following and a compilation of strategy guides written for it.
Anyways, check it out. You can download it from the App Store here.
This is cool… not only because it has something to do with Ninjas haha. I think Shawnimals did a good job designing their Ninja Town characters, world, etc. The site is colorful, animated and simple as well.