Fred Kaplan at Slate has written a well-informed article about the picture quality on Warner Bros. recent DVD releases. He calls WB the new Criterion, as they seem to be going out of their way to re-release classic films with the best scanning and bit-rate possible. I love seeing popular media finally understanding that picture quality matters.
As someone who owns the first DVD release of Casablanca
as well as Warner's new special edition, I can vouch that the picture quality of the new version is indeed absolutely stunning.