A friend of mine convinced me to download a couple of their songs from their album Frankenstein Girls Will Seem Strangly Sexy and my god, these guys (and gals) beat ass. Kind of a fusion of System of a Down and Bloodhound Gang and very offensive. My highest recommendation.
edited because i'm an ass
(edited by astrobstrd on 22.1.03 0102) "All we are is meat."
i am also a pretty big fan of MSI; i think it's their ability to be really really weird but have pop hooks at the same time. kind of like a scatological, industrial-metal version of faith no more (my favorite band of all time).
also, i haven't heard it yet, but their lead singer, "little jimmy urine," recently released a side project called "the left rights." should be worth checking out for hardcore MSI fans..
I wasn't a huge Stones fan, but I did own Hot Rocks before I went to the opening night of the Bridges to Babylon tour, and I found that pretty much gave me all the info I needed to know most of the material.