Referrer Spamming

Going through the referrers for the web sites I run, I came across the wonderfully inane fad of HTTP Referrer Spamming. Google the details yourself to learn all about it. For now, my only option is to just delete those entries from my access logs on a regular basis (automated script time?) and hope people stop wasting their time. I would just turn it off all together, but its still interesting to know how links to my sites, and how people are finding them.