As far as Blogs go, I really can't reccomend SirensSound. I read it for a while and while I did find some truly wonderful music (Escape the Day, mainly) the guy who updates it moves WAY too fast and he never posts his own descriptions for an album (occasionally he types maybe a sentence or two but it's hardly insightful.) It's basically everything I hate about the mediafire thread on crack. I'm sure there are better post-rock blogs out there that have some more insight to them. One of the best parts of blogs is reading what the author has to say about the music being uploaded. Which is probably why I read mostly punk blogs now.
Anyway, this is what I read currently.
http://zen-face-punch.blogspot.com/ Is probably my favorite blog ever. Dude posts all types of punk here and oh dear god, can he write about it. I don't know why but I absolutely love the way he writes about music. Even if you don't like punk, this is probably a good blog to read since he can write so well. This really stands out with his posts about shows. He makes
really good posts about shows.
http://itsachugknocklife.blogspot.com/ Is another pretty good blog I read. I don't think the writing is as good as Zen's, but its not bad by any means. This guy has a little more focus on the emo end of punk, which is my favorite type so I guess it's fairly obvious why I read this blog. He also lives in Hagerstown, which is pretty far from be but close enough that sometimes he talks about stuff in my local scene, which is pretty rad too.
I would also post about SAL but I'm sure Michael will have more to say about that than I ever will.