I myself have used SmartPageRank.com to analyze my site and it has been a great tool to check the Page Rank from multiple datacenter. It displays no. of backlinks in Google, Yahoo, MSN, Dmoz Links with Alexa traffic ranking. Moreover the tool also estimates the market value of your site & will automatically send email if PR gets updated.

Guys just check out this tool at http://www.SmartPageRank.com