Often it can be helpful to see what different data centers show for page rank. We have compiled a list of sites that show page rank for multiple Google data centers.

Live PageRank - checks many datacenters and uses a nice ajax implementation.
Dig Pagerank - Allows for checking of datacenters by IP range. This is a very popular site.
Live PR Ezer Google Datacenters Live PR - in addition to page rank, it offers some other helpful info too.
McDar's Google Watch Tool - this is one of the first tools created for checking multiple datacenters and it works great.
Rank Alert Google PageRank Datacenter Watch - checks 72 datacenters at the time of this writing and shows results pretty fast, though it can take a while to complete.
Datacenter Pagerank Check - a site in German for our German PR Checkers.
Oyoy PageRank per DC tool - you'll find some other nice tools on this site too.
LinkVendor Multi-PageRank Tool - Results were somewhat slow when it was tested.
PR Checking Tool - Checks up to 30 Datacenters
Smart PageRank - Works fast and has a great feature to allow for checking of some additional statistics about the site.
All SEO Google Datacenter PageRank Checker - Works fast, and clean interface.
Text Link Advisor PageRank Checker - failed to show results at the time of testing.
iWebTool PageRank Checker - a popular site with lots of other great tools.