Captcha
A long time ago my friend Erich Musick polished up a script written by Drew Phillips to create a usable Captcha library for PHP. Since then I've updated it, polished it up and made it compatible with PHP5. You can grab a copy of the library below, continuing with the licensing on the work of Erich and Phillips it's release GPL. You'll need some TTF fonts to use it, and I highly recommend the infamous Vera fonts by Bitstream which can be found here.
You can see an example of this script over at my contact page.
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