http://www.slate.com/blogs/blogs/bigsort/archive/2008/10/29/the-many-ways-we-sort-ourselves.aspxBefore last week, every time Valdis Krebs mapped the reading habits of those buying political books through Amazon.com, he found a few volumes read by both the left and the right . Krebs used data from Amazon to discover the patterns among readers ofenCommunityServer 2.1 SP2 (Build: 61129.2)