Waypath released a new service, link reference searching. I tried it with varied results. Analyzing clay shirky's situated software essay turned up nothing. Not quite sure I believe that one. http://www.scripting.com/ seemed to latch onto boilerplate. http://www.kinja.com/ seemed to do a lot better.
All in all, I'm not sure how end user useful these things are, but they make for great building blocks for other services.