Brin gets high marks for the novel Earth in which he tackles the very hard problem of thinking about the world 50 years into the future. For one thing, the Earth in the year 2035 is completely dominated by the "net". If you want to read about some intelligent extrapolation of the Internet world, read this book.
Earth has some flaws, namely a lack of really engaging characters and a resort to a "duex ex machina" which is brought on at the end to solve most of the problems that have been created. I personally found most of Brin's future convincing and rather bleak. Still, as a work of serious imagination and speculation, this book is not to be missed.
Review by colin glassey at