read about the BSD subsystem of OS X
read about how to make Illustrator work
read about how to do complicated things in Photoshop
look for various OS X skins on the web
work on my own skin for OS X since all the ones I see seem to look alike
read more about Windows although I'm not sure if O'Reilly has anything helpful on esoteric "features"
should I do something non-computer related?? perish the thought.