If you like alternative music go to http://www.myspace.com/transmissions.
Every month a different band does a live acoustic set in the MySpace studios. You can watch the performance and interviews on line and then download the exclusive tracks for free.
You don't need to belong to MySpace. The set is usually about 4-5 songs and mostly by Alt Rock bands (ex: Band of Skulls, NOFX, Vampire Weekend, Eels, White Rabbits and more)