Google has an interesting new Firefox extension, Blogger web comments, that allows you to check for blog posts about a website. It gives me a little pop up listing excerpts from the comment sites. It appears to be based on their link: search. This definitely has some research possibilities.
Speaking of Firefox extensions, I was just able to update my Web Developer extension for the latest Firefox version. I probably use it more than any of the other extensions. Anyone else have any extensions to recommend?