Among the essays here are included a "history" of Unix, essays about Cygnus (who offers a source code complier program) and Red Hat (who offers Linux), two businesses that sell services related to open source, an essay about the effects of releasing open source code for Netscape, one about the GNU Operating System and even one by Linux Torvals, the "father" of Linux.
What's continually fascinating to me the more I read about Open Source is the amount of time and energy others voluntarily put into an open source project to make it work that much better. Not to mention the entire "society" that is built around Open Source.
An interesting read, along with the Cathedral and the Bazaar.
Others I was less impressed with. Stallman's article is predictable and self-serving. He explains how he evolved his software-as-gift philosophy but doesn't come close to terms with how the software industry can support substantial employment if all source is given away. There's yet another history of the different branches of BSD Unix. There's a breathtaking inside account of the launch of Mozilla which ends with the fancy Silicon Valley party when development has finally gotten underway. The low point is Larry Wall's "essay", which is a frankly ridiculous waste of time and print.
Although this is a mixed bag, there's enough reference material and interesting points of view to keep the book around.