Here it is-- a comprehensive, one-post guide to everything we learned at BlizzCon 2007. From Alleria to Zul'Aman, it's all here. Everything we know about Death Knights, Wrath of the Lich King, what's happening in Azeroth between now and the next expansion release, what Blizzard thinks about midlevel content, and how they're going to deal with the AFKers in Alterac.
From top to bottom, in alphabetical order, here's every single new thing WoW Insider learned (and confirmed-- no speculation here) in Anaheim this weekend. If you have questions or additions, add them below, and I'll either update the list, or answer them to the best of my knowledge. Enjoy.