I’ve hacked together support for Pingbacks. There are pros and cons to Trackback and Pingback. Pingback is more automated. Trackback has wider support because it is integrated into the popular Movable Type blogware.
To speed implementation, I borrowed some of my code from the b2 blog system. Specifically, the code for sending a Pingback ping. But I coded the XML-RPC server-side pingback.ping method for incoming pings on my own. Currently, it’s still not fully tested. But it should work. If you’ve got a Pingback-enabled blog, link to this story and help me test 
http://www.dummy-blog.org/ is there to help you test your pingback code.
Also, it is suggested that pingback reports, trackback reports, and comments be shown as one item, since they aren’t, to the user, any different.
HTH.
Thanks for the pointer. I thought I remembered there being a test blog somewhere, but I had neglected to bookmark it.