Right now I'm running a few websites and a blog using Drupal. I used to allow any comments but had to approve them before they would be published...I had to go through tens of comments per day that were spam and delete them.
I ended up installing the CAPTCHA drupal module which adds an image where you enter in the letters the image is displaying. You can control the distortion and such for the image displayed. All in all, its been a really great module to install, has brought my comment spam down to zero.
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