Trackbacks seems like they aren't being exploited fully, by people who would do such a thing.
As I understand it Andrew Sullivan gets thousands of hits daily and I hardly see his trackback thing at anything other than 0. Surely some people would click on it. Maybe it is broken.
This is a test. If you came here from there, click on my google ads so I can make enough money to spam professionally
http://www.typepad.com/t/trackback/2224950/37282232 link