Shared source is really an amazing subversion of the open-source concept, because if you are a programmer working at a company with a shared-source license, and you glimpse any of their code, MS could, in effect, own your brain from that day on. Any code you wrote from that point on could be scrutinized to make sure you weren't stealing any of the code you saw. I don't consider shared-source an alternative to the binary open/closed source.