Was just listening to the new Joe Beats instrumental album ('Diverse Recourse' - really good). It starts off with a Groundhogs sample, which has had me listening to 'Split: Part Two' on loop for the last hour. Check it out if you've never heard it.

Split: Part Two
http://www.sendspace.com/file/02reqe

These guys hardly ever get mentioned when 70's rock is discussed. Their stuff might be patchy, but Split is a classic.