CAPTCHAs

[Ic3]

Has anyone implemented one themselves? How good do they really work against spam bots? My site is being harassed by spam bots, and i need to find a cheap (read free) way to stop them..

The site is written in ASP, but soon to be convereted to ASP.Net, who knows of good Captcha's in those languages?

Cheers

[Spingo]

All I can say is BOOOYAHHH! (http://www.u229.no/stuff/Captcha/) - uses plain ole ASP.

And If you've got dot net... (http://www.dotnetfreak.co.uk/blog/archive/2004/11/06/166.aspx)

[EtTuBrute]

Heres one that ive used, no problems, its written in c#

http://www.codeproject.com/aspnet/CaptchaImage.asp