This fellow from the UK convinced me to give Mollum a try: Tackling Comment Spam on Drupal.
Mollum was created by the guy who founded Drupal and Talk of the Sound is a Drupal site so this made good sense.
We also added in a module that blocks anonymous comments that contain hyperlinks (which is usually what spammers added to their comments).
Commenting may change a bit and you might occasionally be asked to complete a captcha but this should help block spam freeing us up to approve legitimate comments quicker.
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