[hackmiester]

For the amount of *nix people I see showing out on here, I'm surprised that it's only 10% - although for the Web in general, that's an absurdly high number, still!

[nitrogen]

Some percentage of Windows visits could be browsing at work, maybe?

[hackmiester]

Hmm...

HN could use the user's ISP to guess whether they were home or at work, then correlate that with OS data.

That's actually an interesting idea!