Reviewer classes

This year at Capclave, a science fiction convention in the Washington, DC area there will be a session on how to write a book review. Peter Heck, reviewer for Asimov's will be the moderator and I am sure it will be a very good session. Alas, I am on convention staff and not able to attend.

Does anyone know of other training sessions or tools for reviewers? This could even be things like listservs.
Thanks!

*hyper-bump*

I took an on-line class through Stanford University for magazine writing that included a segment on book reviews. The review I wrote for that class ended up getting me a permanent book reviewing gig with a monthly ezine. All-in-all, quite a success!