Recently, the online poker operator, Absolute Poker, has been discovered to have certain players able to see the hole cards of other players. This has been revealed through extensive and detailed statistical analysis, and consideration of a large number of hand history records. See here for more info: http://www.absolutepokercheats.com/ Mainstream media link: http://freakonomics.blogs.nytimes.com/2007/09/20/how-not-to-cheat/