Auction House 101 - Your introduction to the AH workings and profits.
El's Extreme Anglin' - Fishing guide with gear locations and achievements. (6/27/15, Site might be gone for good.)
Kuja's Gold Mine - Indexed blog of gold making and farming tips.
Tarou WoW Guides - Profession leveling, farming, event, and other guides.
WoW Professions - Profession leveling and farming guides.
The Undermine Journal - A source for auction house statistics and data.
WoW-Pro - Tradeskill, gold making, and other guides.
WoW Token Info - WoW Token prices and historical statistics from the auction houses of World of Warcraft.