This might be worth a try, especially since it's free for non-commercial purposes:
http://akismet.com/faq/[snip]
Can Akismet be used for other things besides WordPress?
Absolutely. The Akismet API can be adapted for almost any application with submitted content, including forums, wikis, and contact forms. If you want to adapt it for a different system, please join our development community.
[snip]
Should I use any other spam plugins?
We ask that you turn off all other spam plugins as they may reduce the effectiveness of Akismet. Besides, you shouldn't need them anymore! :) But if you are investigating alternatives, we recommend checking out Bad Behavior and Spam Karma, both which integrate with Akismet nicely.
[snip]
Terms of service at
http://akismet.com/tos/##########################################################
Judyth Mermelstein "cogito ergo lego ergo cogito..."
Montreal, QC <
[hidden email]>
Canada H4G 1J4 <
[hidden email]>
##########################################################
"A word to the wise is sufficient. For others, use more."
"Un mot suffit aux sages; pour les autres, il en faut plus."
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