Alright, let me break down my favorites:
http://www.newflux.blogspot.com/
Fluxbog. It's one of the originals. Mostly electro and electronic based pop. It used to be more interesting I think, more accesibly music. Posts some really weird shit, but it's still good.
http://tofuhut.blogspot.com/
The Tofu Hut. He basically has a theme every week or so. And pulls out totally hidden and unknown gems and stuff. Not really for everybody, but every once in a while he slips in things that are fantastic.
http://www.tangmonkey.com/blogs/music/
Said The Gramaphone. Another one of the originals and most popular. More accesible stuff. I often already know the songs that get posted (there's guest posters quite often, it seems) But it's still good.
http://teachingtheindiekidstodanceagain.blogspot.com/
Teaching the Indie Kids To Dance Again. Overall, I think this one fits most people on obner the best.
http://www.o-dub.com/soulsides/index.html
Rare soul and hip hop. He had a feature in Rolling Stone magazine about 3 issues back.
http://cocaineblunts.com/
Cocaine Blunts. More soul and hip hop. Sometimes lost gems, sometimes new stuff. Not updated everyday like a lot of them, but it's good.
http://copycommaright.blogspot.com/
Copy, Right? This is all covers. Pretty interesting.
http://sixeyes.blogspot.com/
The most updated one. Usually about like 5 times a day, it seems. Kinda crazy and chaotic, but I've found some really good stuff there. If there's any site that would get shut down, this would be the one. He often posts links to full albums and such.
Ok, there ya go. Those are the ones I go to most.