Command Circuit - Discussion board with areas for deck design (with good feedback), card trading, and upcoming tournament information.

BT CCG Ladder - Ladder standings for on-line BT:CCG play.

Yahoo! Groups - Battletech CCG - Highly active maillist for all things BT:CCG. A player's organization is here, along with a rulings committee, file areas with lots of artwork, and most importantly an Apprentice patch to allow on-line play (tournaments are regularly organized as well).

BattleTech:TCG Sarnage Home Page - This site is dedicated to creating a 'Player's expansion set' for the BT card game. Many of the links appear empty, but click on the 'cards submitted' link to see a long list of interesting card ideas.

Wizards' BattleTech Vault - The remains of the BT website at Wizards of the Coast. Still has all the decklists and rules from when the game was 'active'.