I think one of the coolest parts about having a blog is being able to see who communicates about it around the web, and Technorati is awesome for that.  I regularly click on the "who blogs about me" link (http://www.technorati.com/search/http://blogs.msdn.com/michael_affronti?cc=hwnjjtb5rc) to see what types of feedback people have on our work here in Outlook.