神马文学网captcha
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http://www.jason-palmer.com/ruby-on-rails-tutorials/database-driven-captcha
http://www.lafdc.com/captcha/
http://local.wasp.uwa.edu.au/~pbourke/projection/lenscorrection/
http://www.crt.realtors.org/projects/reCaptcha/ （java）
http://www.codinghorror.com/blog/archives/001001.html
http://www.slightlyshadyseo.com/?p=4
http://www.lafdc.com/captcha/
http://local.wasp.uwa.edu.au/~pbourke/projection/lenscorrection/
http://www.crt.realtors.org/projects/reCaptcha/ （java）
http://www.codinghorror.com/blog/archives/001001.html
http://www.slightlyshadyseo.com/?p=4