For me, the
Random active metal blogs has been the best site for downloading rare albums. Some awesome blogs that i've found recently are :
http://onexpath.blogspot.com/
http://thecourseofdarkness.blogspot.com/2007/04/metal-museum.html
http://lockjaw-yappy.blogspot.com/
http://sexbeergrindcore.blogspot.com/?zx=d6f268eb9f8b1135
http://goodnoisycore.blogspot.com/
http://noisecorporation.blogspot.com/
http://metalhardcoreunderground.blogspot.com/?zx=92fb75732e7cc209
http://punknotprofit.blogspot.com/
And,
The One that i've heavily downloading from is this:
http://tributes-of-metal.blogspot.com/search/label/Earth%20Crisis
This blog has almost all the tribute albums that exist.
GOLDMINE !!!
I DON'T KNOW WHAT GOD IS BUT I KNOW WHAT HE ISN'T.