BrainBuster - a Logic Captcha plugin for Rails

Hi all,

I'm happy to announce the release of BrainBuster, a Logic Captcha
plugin for Rails. I'm calling this version 0.5, btw, because I've been
developing it and testing it for awhile on the Madison Rails wiki.

What is a logic captcha? Its a test to try and tell computers and
humans apart via a simple logic puzzle, math problem, or word problem.
The big benefit over typical image based captchas is that a logic
captcha is fully accessible for visually-impaired users who use screen
readers. Plus I think they are less annoying then trying to decipher
the crazy images many captchas use.

Logic captchas may exclude foreign users who don't speak the language
the questions are given in, and may exclude cognitively disabled
users. It could also be defeated by a determined script kiddie, but
then again every form of anti-spam measures can be defeated
eventually.

I haven't got anon SVN access set up yet, so for right now I just have
a page here with more details. You can see try out the captcha on this
test page at the Madison Ruby on Rails wiki. If you just want to look
at the code, grab the zip file.

Please post all comments, feedback, and snide remarks about the actual
plugin on the BrainBuster homepage here ====>

http://www.robsanheim.com/brain-buster

I hope some folks find this useful!

- Rob