I have, as of late, receive a huge number of spam trackbacks to my site. In the last month or so, I have removed about 100 trackbacks going to spam sites. To combat this problem, I have shut down the trackback feature of this site.
I have had a few legitimate trackbacks in the past, though this is not a highly utilized feature. If you want to place a trackback, let me know through the Contact Me option on the menu to the right and I will put it in. Sorry for the inconvenience.