I don't really like the Kasparov DVD as he only talk about some nitty gitty things in the main lines. Instead of explaining why certan moves are bad he says things like "I have done some reserch in the other lines and found that black can equalize against it, therefore I play like this" (well almost) it is rather fun to wach Kasparov but don't feel I really learned something.
Matthew Sandlers book is very good although I think the QGD is a rather boring opening... I've also heard there's a new starting out book on the QGD (queens gambit diclined), don't know if it's been published yet.