Captchas basados en imágenes
December 30th, 2009www.dracon.biz/captcha.php
www.phpclasses.org/browse/package/3929.html
www.kessels.nl/captcha/
www.xrvel.com/19/featured-articles/animated-captcha
www.trycaptcha.com/Animatedcaptcha
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Sobre Captcha (Completely Automated Public Turing test to tell Computers and Humans Apart)
http://es.wikipedia.org/wiki/Captcha
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http://code.google.com/p/tesseract-ocr/
http://www.set-ezine.org/index.php?num=38&art=14#top
