We've posted a few new goodies. These strategies round out our collection of guides to the four main wings of Naxxramas:
GluthThaddiusThe Four Horsemen
Only the END-end-game remains now... the Frostwyrm Lair and the Eye of Eternity. We're hard at work at guides for WoW's last 3 bosses, so keep an eye out; they'll be up soon.
By the way -- there was a lot of text to write for Naxx, so in some cases we haven't gotten around to doing anything visual for some of our Naxx guides yet (like a diagram or video). We'll probably be going back and adding diagrams or videos to those guides -- it'll depend on how soon Ulduar hits the PTR.