Interesting story about how Windows’ marketshare is overestimated and Linux’s marketshare is underestimated (and it’s gotta be similar for the Mac). I don’t know how true that is, but the facts are pretty clear: Linux has the momentum and any developer today investing in Windows skills is making a career-ending move. I remember when a developer had better know Windows to have a future, but today that’s simply not the case. If a developer is learning C# and not Java or PHP or learning .Net and not XML-RPC/SOAP, or an IT person is learning Windows administration and not Linux administration they’re gonna have a hard time in a few years finding work.