No not the gamer, but the on-line radio station. Developed by the music genome project it's a personalised web radio system. The idea is that all music has properties, 100's of them per song, like base, treble, bpm, vocal content and style etc. the list goes on.
All this information is then stored in a database and accessible by your good self. So the basic principle is this. You tell them a song you like, it's then searched in the db and played for you. Based on this song the site selects another song and plays it afterwards, you then have the opportunity to rate it good or bad, to further refine the input into the site as to what you like. It will take a while but the site will eventually play you songs you like. I've really found it useful for finding good none-mainstream music. Been playing it in the background for a couple of hours and it's noticibly getting better in it's selections. So i'd recommend you all go and check it out.

http://www.pandora.com/