Why do spammers have to try and ruin every thing that is good? Can't they just leave the world in peace? I thwarted their automated attempts to comment-spam my site by implementing a CAPTCHA test, but I was just nailed with a new tactic: TrackBack Ping spam. I'm of course not alone:
The flood of truly vile Trackback spam today sadly confirms what I was worried about months ago: if we lock down commenting (with things like WP Hashcash and Typekey) it’ll just push them to Trackback. All the captcha in the world won’t fix Trackback.
I'm deleting all the existing spam, but I'm sure new ones will appear before I decide on a solution (probably one or more of the techniques suggested at Learning Movable Type). If any show up attached to this entry, I'll leave them as examples, but anything else is toast.