Backtrackin
Sébastien Paquet's posted a groovy bookmarklet that allows you, with a click of a menubar link, to use Bloglines to find all of the sites that are currently linking to the page you're on.
Very nice. And this was in response to a post by Lilia Efimova, wherein she surveyed the various tools that allow us to trace links in the absence of (or in addition to) trackbacks...