...an easy way to find out the PR on a lot of pages at once.

[Simon]

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.