Good idea, but the demo site is down right now :(.
http://wiki.dlang.org/extensions/DCaptcha/demo.php

Ah, fixed. Broke that when I updated to the easy version.

Nice one, failed the first try :).
You should probably reload on failure, or maybe only after the 3rd attempt or so.
Looks like you ruled out at least half of the spammers.
http://blog.codinghorror.com/separating-programming-sheep-from-non-programming-goats/

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