There's two ways to do this. I could tell you that Baby Monkey is a terrific running game, with a really fun double-jump mechanic, bright and colorful graphics, and the catchiest theme song I've heard all year (the game itself is based on Parry Gripp's song). I could say that it's got full Game Center integration, and is available in the App Store for just 99 cents right now. And I could tell you that it's a must-buy title with lots of fun and replay value.
Or, I could just tell you that it's got a baby monkey that rides backwards on a pig. Either way, you should be on your way to the App Store to pick it up right now.