Would like to suggest to stop by on web diagnostic You'll know not just PR but all important site's/domain's parameters we must know such as validation of PR, Alexa Rank, Backlinks, SERP, Indexed, etc.
It's better to search some site dedicated for determining PR like digpagerank.com for you to see whether PR is fake or not...
You can download Google Toolbar, or you can check through Digpagerank or if you need to check 10 domains then go to multipagerank.com
I like http://livepr.ezer.com It can check fake pr and save link, index and pr history It contents more info