Are we still having this conversation? Use whatever helps you best to do what you need to do.
I use Linux on my laptop--this is the machine I use for most of my 'work'. I run XP in a VM on it when I need to use MS Office or something. For most of the things that I need to do, Windows is a terrible chore to use.
On my desktop I run Win7, because it's pretty comfortable for gaming and web-surfing. When I do work on it, it's usually in a Linux VM.