Rodney P Freestyle App Advert
First, I rarely see adverts that make me want to buy the products they're promoting, but this does just that.
Second, I forgot how cool Rodney P is.
UPDATE: Please do not buy this product, it does not sync properly. Shame on Rodders and Skitz for putting their names to it.
UPDATE: It seems this bug was specific to the iPhone 4 and a new version has now been released to rectify the problem.