This article is an interview with Rob Short.. the guy who is the VP of Windows Core Tech... interesting stuff
It talks about what Linux and Unix have over 2003...
here is a tidbit:
"We've built a patch mechanism in 2003 that will be shipped externally. We'll be able to patch probably two thirds of the components without shutting the system down. That's an area where the Unix guys are ahead of us, because of the way they do redirection -- they can patch a file and then change the symbolic link. That's an area where we've got a problem, and we'll fix it in the near future when possible."
Of course this was my favorite quote