The Long Now Blog has a description of and link to a mind-blowing talk given by Jesse Schell at the Long Now Foundation entitled "Visions of the Gamepocalypse."
Schell's thesis is that in the near future everything we do will be a game. Before you write that proposition off as fantastic or pie-in-the-sky, listen to the podcast. The talk runs the gamut of current and future ("5 minutes from now") technologies, including social media, sensors, screens, virtual money, and geotracking, and their application to everything from brushing your teeth to monitoring your dreams.
Of interest to this blog is his discussion of the difference between extrinsic and intrinsic rewards, (see Punished by Rewards for more discussion of these topics), and the lasting power of the latter.
If you can't get to the podcast, at least check out his reading list.
Schell is the CEO of Schell Games, and a former Creative Director of the Disney Imagineering Virtual Reality Studio, and is also on the faculty of the Entertainment Technology Center at Carnegie Mellon University where he teaches classes in Game Design.
More information about Schell can be found on his website.