Trackback spam is on the rise, this is probably a good time to turn off trackbacks for a few weeks. In Wordpress, go to Options > Discussion and uncheck the second checkbox, that says "Allow link notifications from other Weblogs (pingbacks and trackbacks.)".
I have left anonymous comments on, but I have kittens spaminator installed so it's not too bad. I also approve ALL comments before they go live (in Wordpress, on the same page, check "An administrator must approve the comment (regardless of any matches below)".
# Feb 2, 2005