Horses and Courses
Linux is lovely on the original Asus. Point and click web and mail - check. Want to do some light typing - check. Add the solid state drive so you can merrily chuck it around plus the tiny size and you've got the perfect holiday computer. Had trouble getting one from the shops though, I even got told "It doesn't run Windows, are you sure you want one" (Dixons). And yes, one of the reasons I wanted one is because the OS was perfect for my requirements.
Back at work: Need to have compatible docs, spreadsheets, etc, both internally and externally. That'll be MS Office - like it or not it's the corporate world's standard - so Windows XP in our case (could be OSX). Need to run a raft of Adobe software - same again.
At home: As above but adding games to the list, that'll be Vista (has run perfectly for two years, thanks for asking).
Commuting - iPod Touch
I reckon that's a pretty average setup for those of us who don't give a shit what OS we're using as long as we can work and play using the damn things.