The story of the Hurd kernel
I find the story of the Hurd really interesting because it goes much beyond the discussions about the kernel, GNU, Free Software, Linux and computers in general. It involves people, relationships, strategies, decisions, work, commitment, random events and many other things that make life so exciting. It is important to see the mistakes of this project to try to avoid them and it's much easier to spot them now that we know the outcome. I believe that the GNU people did the best they could under the circumstances but, of course, they couldn't predict the future.