Board Game Sites:

Board Game Geek
Boardgaming.com
Game Head
Reddit /r/Boardgames
Dice Tower Network
Pulp Gamer Network
Gaming Gang
Purple Pawn

Role Playing Game Sites:

Wizards of the Coast
Paizo Publishing
Evil Hat
Steve Jackson Games
Pelgrane Press
ENWorld

Miniature Gaming Sites:

Games Workshop
Dakka Dakka
Reaper Minis
Privateer Press
Wyrd Minis
Impact! Minis

Card Game Sites:

Wizards of the Coast
Pokemon
Yugioh
World of Warcraft TCG
The Spoils
Fantasy Flight LCG