If you mean finding the actual PR of a site than I'd suggest you use the Google toolbar or the SearchStatus plugin for Firefox.

You can also try the Alexa Toolbar. Alexa's rank is a little bit different, but it is an easy rank to compare if you want to find sites to focus on for backlinks.

i think the google toolbar will help with pr

for me the best tool to use is the seobook plugin for firefox...

when you do a search on google and the plugin is activated it adds extra information under each returned result, this info is invaluable and also includes google pr rank

HTH

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