I'm trying to build a comprehensive collection of Knightmare Chess related links. It's slim pickins so far. If you'd like to suggest a resource or have your page added to this list, please contact me.

Steve Jackson Games
The official Knightmare Chess Homepage
The official KC rulings page and FAQ - worth bookmarking
Another fan's page - these guys have retuned the cards and suggested new point values.
The Chess Variants Homepage - Many strange ways to modify an ancient game
Background info on Tempete, the antecedent to Knightmare Chess
Buy Knightmare Chess online!
Cheapass Games - What I play when I'm not playing KC
My BOMIS webring on Knightmare Chess