It's amazing how fast the spam bots got hold of Code Baboon. One post on Drupal Planet was all it took to get masses of rubbish comments advertising pharmaceuticals and who-knows-what-else!

I could just turn comment moderation on, but I find it's a little annoying from the perspective of the genuine commenter, at least, more annoying than a captcha. If anyone disagrees with this, please let me know, but until then I'm enabling the captcha module which has a couple of simple are-you-human tests.