CAPTCHA and ColdFusion

While getting caught up on lists, I came across an interesting thread on CAPTCHAs, or programs that attempt to tell humans apart from computers. We most often come across such technology when registering or leaving a comments on weblogs and we are asked to type in a sequence of numbers and/or letters from a distorted image. Of course, this is to prevent spammers from leaving such constructive comments as “Great site! Visit texasholdem-mortgages-cialias-lolita.net!”.

Someone pointed out a ColdFusion implementation at emerle.net called cfx_captcha. I haven’t tried it, but it looks like it would do the trick. Is anyone else out there using something like this to protect their forms? If so, what are you using, and where can the ColdFusion community find it? (And please — no comments about “enlargements”.)