Have you noticed that your site’s PageRank - Google’s measure of importance of a page, as represented by a rating of 0 to 10 and a little green bar in the Google Toolbar - has changed in the past few days?

If you did, there’s a good reason for that: On October 1, Google’s Matt Cutts announced that Google started to export updated PageRank values on Friday, September 29. The new PageRank values should be visible at most Google data centers, which means you might still seen some PageRank differences depending on what data center handles a search query.

Google updates the PageRank measures that are displayed in the Google Toolbar every three to four months. For more information on Google PageRank, read our FAQ: Google PageRank. Follow the link to read Matt Cutts’ original blog post New Toolbar PageRanks visible.