Aaron just keeps churning them out, and this is the best yet: SEO For Firefox (beta)
The plug-in allows you to see details like PR, edu and govt links, directory links, KW and traffic data, and more, right in the serps.
At a glance, and with a few clicks, you can gather a wealth of data that will help in your seo campaigns.
Looks like this:
In beta, so you may encounter a few bugs.
Nice work, Aaron.