Cool site: Technorati: Web Services for bloggers.: "Find out who's linking to you.
Cosmos allows you to find what's new in the blogging universe, and find out who's linking to whom. Simply type in a URL of a blog, website, or interesting article on the web, and Cosmos will tell you which bloggers are linking to the URL.
New! Keyword Search (Beta)
You asked for it, and we delivered. Technorati's new keyword search feature provides you with the most up-to-date search of all of the weblogs that Technorati tracks - over 360,000 at last count! We refresh our search indexes multiple times per day, so you should be able to stay on top of everything new that bloggers are talking about."