I had to turn off Trackbacks some time ago, since I was getting very heavily spammed. It would be nice if a IP.Blog could be more robust in its anti-spam defenses.
I think b2evolution uses a centralized spam id set-up. That might be one solution.

Myr

I agree this is very much needed, as well as being able to multi delete them. I ahve to go into the DB and just empty the table totally becuase there are so many. I try to look at them on the site and be sure they look like spam, but after hundreds all being spam I just finally give up and delete them all. And my sites are not active at all, so if my site gets thousands of spam trackbacks.... I assume active sites would get tons more.