Google’s Toolbar PageRank, the value that you can obtain by surfing websites while the Google Toolbar is installed, has been available via a number of websites for years, ever since someone figured out how to reverse engineer the protocol that the Toolbar uses to talk to Google’s datacenters to obtain the value. Google appears to have been fairly tolerant of tools that obtain this data over the years (otherwise many of them would have been banned, or they would have changed the protocol frequently, etc.). This tolerance sometimes makes me suspect that Toolbar PageRank is a bit of a purposeful red herring, and ranking is perhaps all about anchor text instead, but that’s a whole other discussion.
The most popular tool for checking individual PageRank values is probably Read on »