I had a chance to sit down and read Tor: From the Dark Web to the Future of Privacy by Ben Collier
I highly recommend it. I think it captures the history beautifully and its a nice reminder of how these projects play out over decades.
It can be very easy to get caught up in the day-by-day/week-by-week rush/drama/critiques/effort and having a history like this puts that nicely in perspective.
Go read it.