Yahoo! Groups - Battletech CCG
Discussion group containing file areas with artwork, and an Apprentice patch to allow on-line play.

Wizards' BattleTech Vault
Official Wizards of the Coast site. Provides card lists, rules and errdata, storyline, and deck building tips.

The Foxes Den
Checklists and deck listings.

Battletech Galaxies CCG
An unofficial expansion created by Bullfrog, Vykos and FnF.