I thoroughly enjoyed this title although it's longer than I'd like. It took me almost three days to finish.
Anderson has an interesting take on "free" that is sometimes dead-on and sometimes off-target. Overall, he does a good job describing the different approaches to "free" and gives a good argument for using "free" to grow sales. At times he tips over into fantasy land, but the bulk of this book is informative and well worth the listen.
Plus, it's free...
I still learned some interesting things, and it was entertaining to look back and see what occurred after the publishing of this book, but a lot of the examples have already become outdated. References to Netflix DVD rentals (all but dead) and discussions about sites like MySpace and Digg really date the book. Information regarding theory is still mostly valid, but I constantly kept thinking about how dated the book was and inevitably questioning if it really was still valid because of it.