Pre and Cataclysm guides:
Digren's 4.0.3a guide ~ Easy to read, updates frequently, shows gearing levels.
Vexryn's Pre-Raid Gear Progression ~ Cross referenced with list of enchants and gems.
Tank spots pre Raid gear ~ Broken down slot by slot.
Pt.1 and Pt.2 ~ really easy to read and explination via Guarded by the Light thanks Resonate.
Pre 4.0.1 ~ simple and handy.
DIY pieces ~ If you are into do it yourself guides and want to look up Piece by Piece.
Gems and enchants:
Digrens 4.0.x ~ Updated frequently, shows threat vs surv stats.
See Vexryn's above for info.
Spec and glyph:
Theck's ~ spec and glyph guide Simply amazing!
Finding the right guild -Here
Who can CC what? Pretty complete list.
Spoony great guide- very indepth and always a great read.
Cataclysm Raid info:
Tank spot movie links
Stratfu speed raid 1
StratFu Speed raid 2
More Coming soon!