I somehow solved the comment spam problem in the past. But spammers are clever. They are now using even the trackback features of most blog software. The past weeks, this blog has been suffering from trackback spams.
I have recently applied this SpamAssassin-based WordPress Plug-in. I cannot recommend it yet since I still have to see if this is going to work find. Give me a week and I’ll give an update. But if you have been so irritated as I am, you can try this anyway. It won’t hurt your blog. ;) You can always deactivate from your control panel.