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I do most of my work on my iPad or iPhone. So I just hit the lock and home button at the same time
PC: I use Fraps for on screen video and screenshotsAndroid: press volume down & power/lock
In all honesty, I don't really use screen shot snaps for anything but if I ever needed to then I just simply press the "Print scrn/Sysrq" button on any keyboard.
FOR MAC; Command-Shift-4, then select an area: it automatically saves to your desktop
I use a program called "snipping tool". It came installed in my comp. I just open the program and highlight what part of the screen do I want to take a pic of. When I use my iPod/iPad I press the power/lock button and the home button at the same time.