Which revision control system?
etal: Out of the three leading free DSCMs -- Git, Mercurial, Bazaar -- none seem in danger of going extinct any time soon. Bazaar is the foundation for Launchpad and Ubuntu, almost irrevocably. Mercurial has less buzz than Git for open-source projects, but I suspect it's even more popular in the business world, and its Windows support is solid. Mozilla uses it, anyway. So you might want to give the other distributed systems, particularly Mercurial, another look.