Eugene Volokh has a great post in response to some linkage he didn't find very appealing:

NO, THANK YOU: Visitors from StormFront, which linked to this site as a sample of what Web logs are -- please go away. There's nothing technical I can do to stop you reading my page, but since you want to spread your "pro-white and anti-Jew message," would my being a Jew help persuade you to just close the window? That's right, Jew. In fact, of the nonanonymous bloggers on this site, the great majority are Jews, and the others -- well, they're only worse, because they're Aryans who seem to like Jews, no?

Look, if you're still reading, don't you get it? We call ourselves The Volokh Conspiracy. That's obviously an allusion to the International Jewish Conspiracy, no? One of the creators of the Internet was Leonard Kleinrock -- coincidence? I think not! We control the banks; we control the media; we're sleeping with your daughters; now we're controlling cyberspace. What's the point of resisting, really?

See, this is why I run my own server; a little bit of hacking in index.cgi will send unwanted visitors elsewhere on the web. Say, somewhere like the Lieberman 2004 Yarmalke Store. But then again, why let the denizens of StormFront miss out on a post like Eugene's?

And there's probably some JavaScript that would do this as well, but I don't speak JavaScript.