Personally I'm of the opinion that if the spambot can defeat the captcha then practically any other type of hurdle you through at them that doesn't require human intervention is pointless.
As of now the only type of captcha that appears to work %100 is questycaptcha unless ReCaptcha has been fixed.
--- On Thu, 4/14/11, Kilian drehbuehne@texttheater.net wrote:
From: Kilian drehbuehne@texttheater.net Subject: Re: [Mediawiki-l] spam, spam, spam, and spam To: mediawiki-l@lists.wikimedia.org Date: Thursday, April 14, 2011, 6:33 AM On 04/14/2011 01:28 PM, Anne Wilson wrote:
How do the spambots know what delay is set?
They probably try periodically.
-Kilian
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