Compared to Google Page Rank, Page Strength gives a more thorough analysis on the importance of a webpage.
Page Strength scores are determined by collecting data from external sources such as Yahoo, Alexa, and Google. SEOmoz
I checked the page strength of my personal blog: The Very Thought Of You (has a Google PR of 2) and here was the result:

To check for your own website’s page strength,
go to SEOmoz
.Below is a preview.

Resources:
http://www.seomoz.org/blog/seomozs-latest-kickbutt-tool-page-strength
http://www.seomoz.org/dp/page-strength-faq
http://www.student-subway.com/images/shout-outs/seomoz-logo.jpg
http://www.seomoz.org/page-strength/
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