[jamie]

  build software that people want to use instead of 
  software that managers want to buy

It seems that people have learned this lesson. Marketing folks even have a term for it: The Consumerization of IT. Spend some time around Gartner reading folk, and you'll hear it incessantly. http://www.gartner.com/press_releases/asset_138285_11.html

Of course, now we have real success stories to point to. The iPhone's enterprise adoption is generally driven by normal folks, and the blackberry driven by managers.