Originally Posted by Caligari

alot of trackback spam as well, but there is also a plugin to thwart that, i forget the name but search under trackback.
also for the hell of it sometimes when updating a blog i will check out the pendng comments, go in and edit them with my links, change a few words and add 10 or 20 modified comments in the space of five minutes. i love personally twisting their spam to suit my blog.