If you've been involved with or followed even to a small degree the whole "web 2.0" movement, the amount of new you'll get from Free will probably add up to about enough to fill an essay... or maybe an article in Wired.There are a few interesting (if not circumstantial) case studies, some light rehashing of the basics of behavioral economics and more than a few suggestions on how to make money giving stuff away. You can find this book on Audible or for Kindle for... you guessed it, free.