A programmer by the name of Webmasterbrain has just put out a neat Firefox extension tool for SEOs.
“The SEO Links extension gives you tooltips specially enhanced for SEOs. When enabled, hovering any link in Firefox will show you Yahoo, MSN, and Google link popularity and ranking data for the URL and anchor text pair. For times you just want regular surfing and tooltips, the extension can be quickly toggled on and off in a single click.”
Check it out and see a screenshot of the tool in action.