Forgive me for the ironic title, but I am getting spammed non-stop by some adult sites. I checked my mail today morning and I see more than 228 new comments on my site!! I had to delete them all by hand. Aah, the pains of becoming popular ;)
I immediately installed Dr Dave's Spam Karma plugin for WordPress and it's been working like a charm ever since. In less than an hour since its installation, it is eaten up more than 214 spam comments!
Dr Dave, more good karma for you :)