Linux for work and wherever I can get away with it, and windows at home. However, I scavenged a Mac, put OSX on it, and am getting rather attached. I'm just trying to avoid slipping into the Apple reality-distortion field, and ending up as another "I love my Mac" zealot.
CP/M? Become a Real Man, and upgrade to VAX/VMS. I want Photoshop for VAX so that I can make lineprinter art again.