BOOKS:
-Mastering The Rubber Guard by Eddie Bravo - Eddie Bravo's Website - This book is just awesome. Tons of pictures, and a flow chart that guides you through the whole rubber guard system. Since getting this I have submitted so many more people in class than before, it really works. You either have to be flexible, or you have to make yourself flexible.
DVDs:
-The Twister by Eddie Bravo - This is footage from tournaments Eddie Bravo has been in, and he comments on them. You get to see how his moves should work in a real match. It's the only DVD I own on jiu jitsu so far, but this and Masterin gthe Rubber Guard book are all I have needed so far.