There are some OS X keyboard shortcuts you don’t want to forget when, for example, your bluetooth mouse runs out of juice and you can’t find your tether-mouse, like, control-F2 (highlight the menu bar). Others you need to know when the computer is off or staring up; e.g. hold down the C key to boot from an optical drive. Having forgotten some of these useful shortcuts once too often I’ve put together a handy-dandy, double-sided, tri-fold crib sheet containing every default (many are configurable) OS X keyboard shortcut I could think of. I thought this might be of use to others so here it is: Default OS X Shortcut Keys. Comments, suggestions, corrections etc. always welcome.