Hi,
I have been through Google PR for a long time. I even installed Google ToolBar for PR. But its not much help as it only tells you update from one Data Center. So, I did a really long search and found some good tools. I'll list them here:
1.
DigPageRank Pagerank Checker Tool in over 700 datacenters
2.
RankNumber.com | Free Page Rank checker
3.
Webmaster Tools & SEO Tools
DigpageRank provides you with PR over 600 different data centers. The other two are good as well. And yeah I am not affiliated with anyone of them.
