Board Game Central - Scrabble
Information, products and links about the game of Scrabble, as well as software for Windows, Macintosh, and other platforms.
boardgamecentral.com

GameRules.org - Scrabble
Offers detailed explanations and rules about how to play Scrabble game and its variations. Each rule article is broken up into logical sections. Also, offers rules to play popular card games, board games and dice games.
gamerules.org