We've gotten some reports from people that the stream seems buggy and that they've had some problems with logging in, so if you've ordered the service, I would recommend logging in early and keeping a tab up with the feed just in case. The main page for the DirecTV feed is here, so head over and make sure you've got everything in place. Don't forget that you need to press the Login button while entering your username and password; don't just hit enter! We'd guess the actual broadcast will begin shortly before the opening ceremonies at 11:00 am PST/2:00 pm EST.
UPDATE: For those of you getting an "Account expired" message, Michael Sacco suggests refreshing the page several times and clearing out your cache/cookies if all else fails. Apparently that's worked for a lot of people -- try it and let us know.
2:02 PM EST: Stream is now live!
BlizzCon 2009 is here! WoW.com has continuing coverage, bringing you the latest in Cataclysm news, live blogs, galleries, and reports right from the convention floor. Check out WoW.com's Guide to BlizzCon for the latest!