Whatever floats yer boat I guess.
The only thing I keep going back into Windows for is Demo's (
http://www.pouet.net) and to use my webcam (which has windows-only drivers).. There's also the occasional Windows-only program I come across... And Flash (which Adobe/Macromedia STILL hasn't ported 8 to Linux yet!).
The graphics are alot better for Windows - but that's the blame of ATi, who won't open up the source code or put more effort into the Linux code.
I find that my Linux install is way better than my Windows install - especially as the video works with almost ALL types of codec, and I don't have to install all this various crap like I do with Quicktime/Real/DivX.
The more I use Linux, the more I like it... I started off liking it, but not getting what I wanted from it. Now I'm getting almost what I want and bit's that I didn't know I wanted - but I can't live without now.