i've been to a few, it's cool to check up every now and then.
http://teachingtheindiekidstodanceagain.blogspot.com/
http://music.for-robots.com/
http://www.tangmonkey.com/blogs/music/
http://newflux.blogspot.com/ (the original mp3 blog)
all of these sites have links to each other. they post the mp3s for you to sample, and you can discuss since it's a blog.