The Greasemonkey scripts found here are by Matthew S Diehl. They are specifically targeted at uncovering data about webpages that can offer insights into Search Engine Optimization (SEO).
Blekko Stats in Search Results
Blekko is a search engine that openly offers a set of SEO targeted data points about each of the pages within its index. This Greasemonkey script gathers the SEO data that Blekko offers and displays it within the search results.
Full Details: Blekko SEO Stats in SERPs Greasemonkey Script