Also, if you want to get technical, and catch some webmasters who use redirects and scripts to cloak and show fake
PR in the toolbar, you'll have to use a '
valid PR page' in order to cross check the
pr with more than just one Google data center (which is what you are shown in the Google toolbar).
There are a few scripts around that will replace the
PR of any given page with that of another page.
Hope that helps.