On <a href=""http://www.schlitt.info/applications/blog/index.php>Tobias Schlitt's weblog today, there's a new little mini-HOWTO on using the Services_Trackback feature of PEAR to help fight trackback spam on your blog.

Trackback spammers only needed a couple of weeks to discover PEARWeb's new trackback feature for their purposes. Of course I had to do something against that, which sadly lasted very long because I've been much too busy. Last week I finally managed to release Services_Trackback 0.5.0 and migrated the PEARWeb code to the new version. Until now, trackback spam seems to be stopped. Ususally there was a huge number new spam trackbacks on PEARWeb per day, since last Tuesday there was not even 1.

Using just a few simple lines of code (including support for wordlists, DNS blacklists, and realtime URI blacklists), you can use this handy toolkit to safeguard your trackback/commenting system. There's a sample here of how this package can be integrated into your existing code...