Blizzard has re-released a behind the scenes DvD that is very cool. I own it from the first release in the collectors edition of WoW and it is well worth the money. Check out the details below:

Get a rare inside look into the Blizzard development process with the World of Warcraft Behind-the-Scenes DVD, on sale now in our online store. Formerly only available in the World of Warcraft Collector's Edition, this DVD contains design commentaries from Blizzard developers, digitally mastered cinematics from World of Warcraft and Warcraft III: The Frozen Throne, exclusive Blizzard artwork, and more.