Re: signup/registration captcha?
Okay I have created a new plugin “Human Test” which will do some tests during registration to try to slow down the bots.
Eventually will do more tricky things like captcha and variable math but for version 0.01 it simply asks what the answer to 2+2 is.
I need to know if this still works with older versions and weird themes:
http://ckon.wordpress.com/files/2008/01/human-test.txt
Awaiting inclusion in the bbPress plugin depository for newer versions.