As I said in my Blu-ray review of "North By Northwest", when major studios really want to get it together for BD releases, they can make really impressive products. "Gone With The Wind" is a perfect marriage of Hollywood nous, production values and acting bravura: similarly, the Blu-ray release gets the full-on treatment, in terms of restoration of the original print and extras.
"Gone With The Wind" is a fantastic investment on Blu-ray. Technicolor films from the 1930s and 1940s tend to look ravishing, paradoxically because of the lessened colour palette (see also "The Adventures Of Robin Hood" (1938)). Respected production designer William Cameron Menzies was behind the "look" of GWtW, and envisaged rich colour alternating with muted tones for more melancholic scenes: the Blu-ray captures his vision triumphantly, with wonderfully dark blacks, glowing oranges and reds, and sombre greys all equally rendered. Although the transfer is only in 4:3, when you get over the fact there is no pseudo-widescreen option (as there was on the DVD of "Snow White" in that BD combi pack) the quality of the images is in my opinion flawless.
As for extras, the second disc abounds with interesting documentaries and cast biographies that add to the experience of one of the genuinely biggest films ever made.