Ok, now I'm really baffled - just checked this link:

http://www.iwebtool.com/pagerank_che...ixelforge.net#

and it provided me a list of google datacentres, with differing ranks, some really high, some ok, some low, some n/a.

Soooo which one? and how can other PR checkers verify they're using the correct datacentre for the result? even our trusted site critique PR checker?