iSlash is a nice puzzle-type title that reminds me of Fruit Ninja, but is probably the old arcade game Qix. You're presented with a shape on screen with a few samurai stars bouncing around inside it, and your task is to slash, with your finger, parts of the shape off, while keeping all of the stars inside a certain area. You've got to slash off up to a certain percentage of the shape to move through the levels, and while the first few are easy, the shapes get tougher later on. It's good fun.
You don't have to trust us -- since the app was released, it's seen over 500,000 downloads from all over the world. Additionally, the developers are already updating it. They've added Game Center support for leaderboards and achievements already, and while there are over 70 levels now, they promise even more to come. The game's available for US$0.99, or there's a lite version to try out if you're not willing to shell out the buck.