NPD's 2009 Household Penetration Study. NPD concludes that Mac owners not only own more computers than the norm, they also own more types of consumer electronics -- the average Apple household owns 48 consumer electronics devices compared to 24 in the average computer household. In fact, NPD suggests that "Apple household owners' actions and purchases can be used by the industry as leading indicators for hot new products and adoption." Unfortunately, there's no direct mention of Linux PC owners because they usually still live with their parents. Oh!