TalkDigger is a meta-search engine. It asks major search engines: "Who links that URL?" The results will then be processed and displayed on Talk Digger. This is a free web service developed by Frederick Giasson.
Couldn't be easier to use, and I love Frederick's honesty on his About page:
I developed an addiction for my blog statistics and for people talking about my writings. I was always checking the link-backs to my domain name on the major search engines...
Then some weeks ago I asked myself that question: why don't you build an application to query all these search engines for you, displaying the results and some statistics of these queries... Then Talk Digger was born.
Hat tip to Anonymous ;-)