Read these articles by Brandon Slay on championship wrestling. They are really really insightful and most apply to submission grappling and Jiu-Jitsu as well. I especially like the ones on intensity (who says wrestlers should spaz?) and good technique. Brandon Slay is da Man!
http://www.brandonslay.com/slaywritescontent.asp?ID=11 booyaahh i actually read an article on nbcolympics.com at the time of his competing, about how he lost weight & his advice, and i got most of my ideas from there.