Nice list Pat. I was gonna do trip-hop and electronica myself, but you beat me to it!
Will add some randoms later.
for free mp3 compilations (inc. rare tracks) from:
J Dilla, MF Grimm, Mr. Lif, Poetic aka Grym Reaper, Kool G Rap, RA the Rugged Man, Shabazz, Hell Razah, Timbo King, Jus Allah, Warcloud, Breeze Brewin, Kid Capri, Count Bass D, Insight and more...