Blizzard has just launched the 2008 version of BlizzCon.com (but that site still redirects elsewhere). You can find the site at Blizzard.com/Blizzcon.
The website also helps you to find ways to get there as well as finding hotels, and will probably fill out with a bit more information before the event. Remember! The tickets are being released on Monday! While they will use 50% more space this time around, the tickets will probably sell out fast as usual.