Well, first off, I have to say the outages aren't wowwiki's fault, for the most part... Whenever the blizz forums are down, traffic goes elsewhere and it acts like the slashdot effect.
Anyway, unfortunately wowwiki is by far the most complete repository of knowledge about the UI system. I don't think anyone has bothered to "compete" because it does such a damned good job of it.
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