This is a tough question to ask accurately.

What you'd really want to know is who uses an OS by choice, subtracting all other factors (e.g. if you're only using an OS because it runs some app that your work requires). There are plenty of reasons anyone might be using several different systems.

In my case, I use 3 different OSes. My only Windows machine is at work; and while I use it for occasional development for Windows, it is mostly a dumb terminal to access a Linux box. At home, I use a Mac by choice, but I can also use it to access Linux at work. Am I a "Windows user" if I visit HN from work? Well, I'd rather not be counted as one.

My usage of windows over last 5yrs has been as you describe 'a dumb terminal to access a Linux box'. [ A long time ago I was very much into the COM electric cool aid, so have used it as a dev platform commercially, but not recently. ]

To be fair my use of OSX over the last year has also been around 50% 'dumb terminal' due to web work.

I just never see people hacking on windows laptops anymore, and on balance I think its a good thing.

I'd wager much higher than that. At the very least, I'm using Win7. Statistics on browser/OS usage from pg would be interesting though.

Seconding the request for Browser/OS Stats.

There are plenty of people around like me who are fine with any OS and use them all for slightly different things. Don't be married to your platform, makes you much happier.