Gnomoradio
[via slashdot]
I insist on the fact that Creative Commons license is one of the most clever progress in freedom (of speech) of that decade.
Gnomoradio software is a free software that allows you to share and download songs / musics published under CC license.
This means that the artists have unreserved some rights on their work to enable the free sharing of these according to the choosen license. The tracks are sorted according to their styles and user ratings.
One thing I dislike: the program is distributed only on Linux (and is included in unstable Debian - sorry, GNU/Debian distro), but the developers set a roadmap indicating they will later port this to more-spreaded OSes (Windows and MacOS).