If you run multiple websites, or just your own, do yourself a favor and download SeoQuake. I use it as a plugin for Firefox and it gives me up to date information on every website I go to.

It not only gives you Google PR, but also yahoo backlinks and indexed pages in Yahoo and Google. Seoquake is also Internet Explorer compatible. Seoquake allows to obtain SEO parameters of the your website on the fly without a lot of research. 

Powered by ScribeFire.