I just published a review of a recent book on digital surveillance and cryptography. Cypherpunks is co-written by four activists, including Julian Assange. A very exciting, provocative book, which I recommend.
In a nice coincidence, or a sign of timeliness, Reporters sans frontières released a new study on governments cracking down on the free internet, and the Western companies who supply them the requisite technology. Those are topics of great concern to Assange et al.