referrer spam is big, and getting bigger. now usually about a third of the referring websites in my referrer logs are fake. I'm considering writing a filter that will go out and hit these websites and look for my URL so I can get rid of the fake ones.

some smart ones keep a dynamic list of links which get updated when you click over from your referrer list with the referrer YOU pass them -- so it looks like you really are linked on some weirdo webpage you've never heard of and looks like it was put together by a porn-seeking thirteen year old on some sort of cold medication.