It looks at everything from the original game, Warcraft: Orcs and Humans, to the failed Thrall-centric loregasm that was Warcraft Adventures right on through to Warcraft II and III. Of course, they also look in detail at World of Warcraft and its two expansions, The Burning Crusade and Wrath of the Lich King.
If you only discovered the Warcraft franchise with WoW, as I did, it's a fascinating glimpse into one of gaming's biggest franchises. World of Warcraft is not just a game or a single mythology, it's the culmination of a decade of gaming history. So if you've got an hour to kill before the fun and games today, you might want to check this out.