Here you can check the current PR of an URL at over five hundred googles data centers. The test will take a couple of minutes, but you´ll see results from each center as soon as it has been queried.
Note: I´ve set the timeout for each datacenter to 5 seconds. This is done to prevent the script from tying up all your connections to my server. Without this checking all of them took about three times as long. It will however make some of the slower centers show up as "not responding".