Sometimes, the amount of work you have pending doesn't allow you to update your blog. You won't event visit it. Then, a rabid spammers horde comes, with an unhealthy lust for flooding your blog selling Viagra, Cialis and this kind of shit. This has been exactly the case of this blog. Result? Above 350.000 commercial comments, a full database, nobody could add comments since months ago... a mess.
I've deleted the comments to start over. But five minutes later there were 20 new SPAM comments! Obviously, I should do something to prevent this from happening...