WoW Wiki has completely moved over to wowpedia.org, (all the articles are intact) and is being hosted by Curse now, with all of the major contributors already back at updating it. Note that it's .org, though, since apparently there is a gold selling site squatting on the .com domain. I've seen a few people grumbling here and there being wanky about Curse, but to be honest, the site is running way faster than it did on Wikia,

Wikia refused to sell them back the old domain name, which is the only reason it's changed.