Also, there's sites like http://www.wowhead.com/ which are pretty deep databases of Stuff In Game.

There's also podcasts about the game - my personal favorite is The Instance, which is basically a talk-about-the-news podcast, but also has interesting things like the Mod Of The Week (WoW has a built-in plug-in format, and there's a lot of mods you can plug in to do stuff to your user experience, everything from cosmetic changes to event recording.

And, as with everything else, there's worldofwarcraft, because there's a community for EVERYTHING on LJ.