Lately I’ve been using http://www.musicovery.com/ every single night. It is just so interesting. Simply select the timeframe of music you want, genres of music and your mood and it gives you an amazing selection of music.

I have no idea how it works but it would be very interesting to know! Thanks to Ernest for pointing this one out. You can read his original post here : http://dotnet.org.za/ernst/archive/2007/07/02/music-that-suits-your-mood.aspx