I've written a small CLOS tutorial for *mathematicians*, which could
interest some.
http://www-fourier.ujf-grenoble.fr/~sergerar/Papers/common-lisp.ps
Sections:
1. Introduction.
2. Common Lisp Object System.
3. What typing is.
4. CLOS and mathematical structures.
5. CLOS and the Kenzo program.
The first three sections, of a quite general scope, could even
interest non-mathematicians.