Updated December 16, 2010: Please note that google search results can vary greatly based on your location and search history even if you are not logged into google. This means checking multiple data centers may not be as effective. Here is a tool from Google that you might also find handy.
Often it can be helpful to see what different datacenters show for pagerank. We have compiled a list of sites that show pagerank for multiple google datacenters.
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 pagerank, 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.
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.
Smart PageRank - wonderful tool that shows many different statistics about your website, and will even email you if the PageRank of your site changes.
FindMatch PR Checker - Checks the most datacenters in one shot.