http://del.icio.us/register
...or know any that produce similar results?
I've looked at various others, but the output is often very hard to make out, and I'd rather not put people off too much for the use I want one for.
http://www.puremango.co.uk/cm_freecap_113.php
http://phpbtree.com/captcha/index.php
http://higginsforpresident.net/projects/tacs/demo/
Conversely there are some that are very obvious;
http://php.webmaster-kit.com/audit.html
Anyone have any recommendations, or the script used by del.icio.us?
