I've been a beta tester on the site fretwar.com ... been a lot of fun. Essentially a 'theme' is posted and then a period of time for folks to submit entries ... then they're voted upon/reviewed by both the other players and the public at large.

It was taken out of beta today and are looking for some real guitar players (all us beta testers have been geeks/programmers that also play guitar).

No cost, no ads ... just fun and a place to show your skills/chops. Even if you don't play, you can hear what others have done.