A couple Lash sorcerers and a couple lascannons, in a Chaos Marine list.
As Daneel mentioned for a Daemons army, Skulltaker and Bloodletter fun.
Another thought would be Fiends of Slaanesh spam. 12 of them, to be precise. 72 rending attacks on the charge (provided all of them make it to him, of course). Admittedly, my math sucks ass, but that should be 6 wounds, 3 unsaved, if statistic average, on the charge.
Edited to amend aforementioned suck-ass math.
Last edited by Wraithian; 07-28-08 at 10:22 PM.