Just an idea for someone who can code this kind of app. Especially now that the sdk is out.
The idea is simple. 1 or two turntables where you can scratch your songs straight from your iphone or ipod. You use your fingers to scratch the turntables. You can also change pitch and tempo with a crossfader. This is a really cool idea and i think it's a killer app. I would take part in making it but i dont know how to code a proper app, unless someone can point me in the right direction (with the sdk).