Normally I do my work on Mac. I use Xcode and Unity, it has my favourite graphics app and tile map app, and I am generally quite happy navigating OS X.
But I still need Windows for one app and one app only. FamiTracker! FamiTracker is by far my favourite music making app. Everything just sounds awesome when it sounds like the NES.
Today I booted up Windows ye olde Windows laptop to do some sound effects for TinyShooter.