That's why I posted here -- to see if there were any other Americans (or Californians) around on this site. It didn't really make sense to post in the old forum when everyone was talking in German... at least since this is the English forum I can read all of the replies.
I've known about Wacken for several years, but never really had the opportunity to go before. I'm hoping that changes next year, since I'd really like to see the best metal festival in the world.
Since you're in Southern California, take a look at
http://www.moshking.com, run by a friend of mine, to find a bunch of cool metal shows in this area. I wouldn't know about half the local metal shows I go to if it wasn't for that site.