It has become wildly apparent to me lately that the kind of games I'm most prone to spend time with are pretty simple in nature. While I think it's great that the iOS devices can handle the processing power of some epic RPG-style undertaking, or a realistic racing game or a Tekken style fight game.. none of that is for me. Now, give me something like Cross Fingers; a puzzle game challenging you to take dissimilar pieces and combine them into a solid tangram and I'm hooked! You can see a trailer for it here or just take my recommendation that it's a dollar well spent.

If that doesn't tickle your fancy, maybe have a look at MobiGames EDGE - a bit more involved graphically and the gameplay looks to be along the lines of a modernized Marble Madness.