A while back I added an entry to my /etc/hosts file for the "evil hyphen site":
127.0.0.1 experts-exchange.com www.experts-exchange.com
It always annoyed me to do a Google search, open a bunch of tabs, and discover I had accidentally opened an experts-exchange page. Redirecting to localhost was my little act of vengeance and lessened the annoyance.
Jeff, why not configure StackOverflow to listen for requests for experts-exchange.com? Then I'll point experts-exchange.com to your IP address in my hosts file.
In addition, you could extract the query string in the REFERER and automatically perform that search on StackOverflow.
1. Search Google for "Ruby upgrade to 1.8.6 on CentOS"
2. (Accidentally) click on the experts-exchange.com link.
3. Request goes to StackOverflow servers because of hosts file entry.
4. StackOverflow sees "Host: www.experts-exchange.com" in the headers, and finds the search query in the REFERER (&q=Ruby+upgrade+to+1.8.6+on+CentOS)
5. StackOverflow runs the search query.
I don't know how many people would edit their /etc/hosts file but I definitely would!