Joel Spolsky explains the difference between Unix programmers and Windows programmers:
What are the cultural differences between Unix and Windows programmers? There are many details and subtleties, but for the most part it comes down to one thing: Unix culture values code which is useful to other programmers, while Windows culture values code which is useful to non-programmers.
This is, of course, a major simplification, but really, that's the big difference: are we programming for programmers or end users? Everything else is commentary.