Also check out the "Shooter's Form" forum right here on Tradgang. Terry's "Form Clock" post was very helpful to me.
On Youtube, check out Moebow's & Jimmy Blackmon's videos. Both guys have a wealth of information shared in their vids.
As for buying DVD's, I agree that the Masters of the BareBow series is great. The 3rd in the set is the most in-depth explaning of a couple guys' styles, with the first 2 discs covering a wider variety of styles, but not REAL detailed in any one of the styles.
Rick Welches "Accuracy Factory" videos are good too. Just a different style than a lot of others'.
Good luck in your search for what works for you, and let us know how they work out for ya.