Chris Anderson,(Chief Editor - Wired magazine) has released his new book: “Free - the future of a radical price”. In the book he describes his radical model of freemium and how the most effective price on a product can be no price at all.
I got it by going to Anderson's "Free" web site, getting the embed code from Scrib'd to paste here, and then downloaded a free unabridged audio version from Audible which I just finished uploading to my iPod through iTunes.
That is a pretty good illustration of the "freemium" model. Enjoy the book yourself below!
FREE (full book) by Chris Anderson