Blizzard has beat independent Machinimists to the punch with their very own video commemorating Brewfest. I can't embed it here but you can go to WoW's European Movie page. Once there you can watch it directly from the site or download it to your desktop. It's short and I recommend watching it through to the end.
While you're at it, head over to You Tube and check out a short video of what happens when you put on the new Beer Goggles you can buy at Brewfest