At the Revenue Bootcamp Conference in Mountain View, Calif., Chris Anderson, author of "Free: The Future of a Radical Price", discusses how different companies use the free-to-premium, or freemium model to not only make money, but often keep customers at a higher rate than fully paid services. There are many economies--ones of status, time, information and more--and the trick is to get people to trade their money for one of them. (from ZDNet)