Collin sent me this clip with Robson Moura teaching a new perspective on the butterfly sweep.  It's very interesting since Robson teaches it very differently from pretty much everyone else I have seen.  I am reading Saulo's new book and Saulo teaches is the more traditional way with a couple really good details.

After watching this I went back and watched one of the Robson videos from his new set.  That guy is inspiring.  I really like his Fusion 2 dvds - I think if you want an attacking game you're hard pressed to beat his style.  You can get them at GroundFighter.