so many out there so I'll name the ones i download from the most:

1.northamericanhardcore (run by a foul-mouthed nintendo-hobo genius on one of the worst free hosting sites out there)
http://northamericanhardcore.50megs.com

2.retinascan (not strcitly a netlabel anymore but one i leeh off still)
http://www.retinascan.de/

3.mp3death
http://mp3death.us/