Friskit is relatively new, and if you use it then tell me what you think. It searches for streaming audio and video, and they want you to sign up so that you can join music groups, bookmark your favourite songs, and recieve music from all over the web with their music inbox. I don't know of any other media search which has a genre option. Friskit plans to let (I assume sell) various parts of their technology, and their page is the demo.