Hello,
For my AI class at the University of Idaho, I wrote a program that will play Connect 4 against you. I used McCLIM, and just tested it against the CVS version. It demonstrates drawing, presentation-to- command translators, and a few other things. I've also commented it a great deal, as Lisp was not the first language of the TA who graded my work. The file is attached to this email, in case you'd like to use it as example code for McCLIM. I'm fairly new to Lisp, so parts may be sub-optimal. If they are, please let me know and I'll improve them.
-David Christiansen