SEOMike - 4:03 pm on Sep 7, 2011 (gmt 0)
There is very good information about Google country biasing contained in Google Patent 7,451,130. Head over to Google's patent search and pull down the PDF. It's a good read and will help you understand some of the things that make a site rank in one country instead of another. The patent is from 2008 but I know from experience that a most of the stuff in it is still very relevant.