Stratfu.com
^ This is my personal favorite strategy site. I've based our 3D sarth strategy around theirs (you can see this on the nav bar on the left of their site) as well as explain Malygos based on their info.
I've just read this fully for the first time and found there will be scheduled times for testing bosses in the PTR. We'll attempt to plan for these accordingly and get in there. Well, I will. We'll see what the other officers think.
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Blizz's sneak peak
^ Cool narrative/informative type deal on Ulduar.
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Wowwiki
^ Wowwiki's Ulduar page. This entails Lore, Blizz's intro, and other bits. This will be updated as more info on Ulduar is openly available.
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MMO-Champion
^ This is a patch 3.1 compilation (Including class changes) but mid way down the page, Ulduar info can be found. This is a VIDEO and pics of Ulduar, as well as Tier models and weapon models.
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Wowhead
^ Details on the Flame Leviathon fight. Hard mode: Towers. Siege vehicle fight. .... Btw, yay siege vehicle fight. <.< /sigh
There will be more to come. Happy hunting raiders.