Very cool site, not just because of its minimalist design, but also because the music is pretty dang good and from independent artists.  This is a pretty awesome replacement for Pandora, you get a fun selection of new and from my experience, good, music while being able to instantly support the artists by buying the album in a few clicks.

As with all these things one wonders how stuff like this starts scaling long term.  The artists that get played the most will be rewarded more and of course who knows how that is determined.  But it is a great start, and certainly will expose more new music than the equivalent Pandora or Last.fm options.