I believe you can find some good inspiration by looking a question that was answered not too long ago:

["What are some good, personalisable online radio / music apps?"][1]

Should be lots of good choices, set up with pros and cons, and already rated.

  [1]: http://webapps.stackexchange.com/questions/3134/what-are-some-good-personalisable-online-radio-music-apps