Tim Kerchmar and Jeremy Ellison seem to be making a game with Corman Common Lisp. They have a number of interesting articles; I particularly liked the one with several examples of abstracting complex operations with macros.
Tim writes "If the comments indicate interest, I can write a tutorial on how to use Clanlib + Corman Lisp on Windows." I tried to indicate interest with a comment, but I couldn't see the CAPTCHA image and got shot down. I'm interested! I'm interested!