Chris Anderson’s book Free! is now available for free in online as well as audio book form.
Below is the first online iteration, being a Scribd hosted version, obviously free to embed wherever you want. Full screen mode is recommended.
You can get the audiobook from Wired, and read more on Andersons’ The Long Tail blog. There’s also an Adobe sponsored give-away from Random House in the UK, which naturally features a printed version of the book. Anderson’s got the details on that too.