http://dojin.co/ is a doujin music sharing site that used to be invite only, but is now available to everyone via registration and such. I think it's a great way to find and listen to new circles and artists, as well as downloading doujin music for free. The layout could be better, but I believe they're in the process of updating it.
dojin.co
Posts
Looks good... Thanks!
Really good music here! Do take the oppunity to sign up!
Thanks for sharing this mis, I signed up to this a little while ago and completely forgot about it.