PageRank Status by ChromeFans.org
The very best Chrome Extension for tracking Google Page Rank and Alexa Rank. At a glance you can see a websites PR and with a few more clicks quickly check its back links using Yahoo Site Explorer. Another thing I like to use it for is seeing just how many of my pages are indexed with Google, you can do that with a click as well.

check your google pagerank with this chrome extension quickly

From what I've seen PageRank Status is very accurate. Many of the online PR tools you input your domain into do not work most of the time and give out of date or inaccurate information. Another key feature of this extension is it's extremely easy to use. Just go to a website and point and click and your checking out all it's search engine data. If you're looking for an on the fly means of checking out a websites validity or monitoring your own everyday without hassle I strongly recommend this extension.

DOWNLOAD

NOTES:

If you have a Blogspot or Tumblr like blog it's not going to track your website because remember it's tracking "Blogspot.com", all the more reason to step up to the plate and get your own domain.

You have to hover over it to get Alexa data but Google PageRank is always displayed.