| I'm not sure but I've only used it for smaller groups of pages so far and it's always given me results that match other services' results. So I'd suggest trying a small group of urls that you know are PR1 or 2 and see what you get. If you still get PR0 then either there's a temporary glitch or :::shudder::: Google just danced again and not in a good way. 
				__________________"If you're happy and you know it, think again." -- Guru Pitka
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