Laurel P has provided a story about EgoSurf. This is a tool that supposedly shows you all the places that refer to one's blog - but when I ran it for me it didn't return Laurel's own blog. Yet I know she's referred to me and added me to her blogroll.
If it did what it said it would be a useful tool for the kind of net analysis I referred to below. By the way if you are interested in that sort of thing there is a very useful website for the International Network for Social Network Analysis.