I'm a member of emusic which means that I get a certain number of track downloads per month. Now obviously you get more music for your money here if you download very long tracks rather than using up all your downloads on minor threat and ending up with only 30 minutes of music to show for it.

My favourites so far:

The Fantomas - Delerium Cordia - Mike Patton fuelled horror rock (1 hour plus track)
Boris - Absolutego - 2 tracks of superb drone.

Anyone got any other faves in a similar vein?