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I'm using Drupal on other sites. I have no more spam using:
Honeypot: adds a hidden field, if it's filled, it's a bot.
SpamBlack Hole: replaces form actions with a dummy URL which is then replaced during form submission using javascript.
Hashcash: javascript proof-of-work algorithm
These techniques are only valid for annonymous users, but developers should take them into account since Askbot should have this feature in the future, since there is a need for allowing anonymous questions and answers, specially, when building a new community.