You'll find many users running Windows in some capacity around here. Many of us are not Apple fan boys and have no problem running Windows in some fashion.
I did a reinstall on the netbook of Windows 7. Haiku was nice for an Alpha but I need an OS on the netbook to do everything I do. Windows 7 is the finest running OS I have ever used on that Acer Aspire One. Very close is Open Suse 11, but the battery life is maybe 20 minutes longer in Win 7 for some reason! nice getting over 2 hours on the netbook!
Besides the netbook, I have a SLI Gaming Machine I built myself with XP SP3, a couple of Dell Worstations running XP SP3 for some video conversion, a back up XP Gaming machine in case and my AMD 64 Bit Laptop with Vista Ultimate.
So yes I run Windows here but on Windows machines! I like to keep my Macs OSX only! I really purchased the Macs for OSX.
And yes, I agree for some it's handy to have a notebook with both OSX and Windows for work, school and other uses. One machine to do it all.