I am always very suspicious of the one-way-to-do-it approach. Like when people say you should only strum over the 12th fret. Kinda like what philpot said, it depends on what it depends on. I use my right palm a lot on the saddle when I'm doing bluesy rock rhythm stuff, chunking, etc. For single note solos, my right thumb, middle & ring fingers may get used. With split string harmony stuff (think of the intro to Brown Eyed Girl), the middle finger on the left hand will dampen the unwanted string in the middle, while the index or ring finger, depending on which one is used takes care of the unused notes on the A string if necessary (if that makes sense). The left hand gets involved when I'm finger picking and chunking. Again, with the chunking, it depends, because sometimes it's the palm on the right killing the chord after the initial attack. But it all gets jumbled up, and I don't even think about it. If I did think about it, I would start messing up!