Here lies a central hub of links to Class Guides scattered around the forums.
Many Mage bits by Phinix: HERE
Mage Macros by Phinix: HERE
Playing with Fire for Mages by Phinix: HERE
Being a Shadow Priest by Remedial: HERE
Sum Warlock advise: HERE
Rogue Specs: HERE
Raiding Warriors stats by Hoobs: HERE
General Warrior guide by Gel: HERE
General Healing advise by Peekay: HERE
General Macros by Xestio: HERE
Note: This list will grow and grow! Keep looking back!
If you have one to add, provide a link (offsite) or type it up and post the link here!