The losing side of the war
Gah. Bots are registering bogus user accounts on one of my home-grown sites. (Which is stupid, because my sites cannot improve their search engine rankings. They don't support the ability for users to post links.) The cruft they're leaving bothers me, so I'm joining the losing side of the war, and implementing a CAPTCHA. Hopefully, I'll buy a few months' relief for my little site.
Anywho, here's the best of what I've found: