Rock Star Beaterator

This is one of the coolest things I've seen in a while. It is a beat creator made by rockstar games, and the best thing is you don't have to download anything... it's all in your browser. There are pre-made loops for you to mix, but there are also individual sound samples available for you to make your own custom loops. When you are done you can save it as an mp3 file. How rad is that? I haven't made anything cool yet because well i'm not that creative, but I'm sure others will come out with some crazy stuff.
Beaterator