> In English-speaking countries, a blue-collar worker is
  > a working class person who performs non-agricultural
  > manual labour. Blue-collar work may involve skilled
  > or unskilled manufacturing, mining, sanitation, 
  > custodial work, oil field work, construction,
  > mechanical maintenance, warehousing, firefighting,
  > technical installation and many other types of
  > physical work.
  >
  > In contrast, the white-collar worker typically
  > performs work in an office environment and may
  > involve sitting at a computer or desk.

Also, the nature of programming is the ability to automate away white-collar work. We're probably going to need new categories, once many of those are gone. We might end up with engineers, a service-worker class and a managerial/executive class.