Jeff Jarvis’ mention of the Technorati: Link Cosmos yesterday apparently was news to lots of people in the blogosphere, including some longtime bloggers. I found it accidentally by tracking my referrers some time back. It is a good device for seeing who is linking to your site. Other good sites for this purpose are PopDex (which I link on my left sidebar toward the bottom), Blogrolling.com (which has a search feature that will let you know who has used their service to blogroll you), and TTLB’s Ecosystem (which is down at the moment). I’m sure there are others, but those are the ones I check.