I’ve just released Disable Trackbacks, a plugin I’ve been using for a while now.
The vast, vast majority of pings sent from other sites are done via pingbacks, not via the old trackback system (I think I’ve gotten like 3 legitimate ones this year or something). However, spammers just love them to death and is pretty much the only ping system they use. So, I wrote this plugin a week or so ago and enabled it on my blog. I’ve gone from a few thousand spams a day to next 0-5 a day. A worthy tradeoff if you ask me (ignoring the couple legitimate ones a year to avoid literally hundreds of thousands of spams).
I also run Cookies For Comments to avoid regular comment spam. In order to post a cookie comment on my site, you must have stylesheets and cookies enabled. Since this is a personal website that isn’t mission critical, I can make that requirement.
Finally Defensio picks up any spams that make it though which are mainly pingbacks from spam blogs (aka splogs).
Spam problem solved, at least for now…