dr dre has a sic blog :
http://www.nahright.com where he uploads some sic stuff every now and again.
find some sic youtube videos, and zamzar them shits into a mp3 for your ipod with
http://www.zamzar.com and going to convert files.
the new rakim is pretty hot, same with dr. octagon, camp lo, gng starr, ace hood, blu (listen to his stuff here :
http://www.myspace.com/herfavcolor , then google dj heat present blu mixtapes and get those for free if you like).
try hypemachine too. its tough for hip hop and that website but if you find a good song it has a link to a blog where you can download the song.
and never forget, wu tang clan can be your best friend if youre looking for some dirty hip hop tracks top ski too.