Whether for pet projects around the house or artistic endeavors, the Dremel multi-tool is an awesome object to have around. In a nutshell, the Dremel is a hand-held drill/grinder/sander/rotary saw. As I found out recently, however, its simplicity (I mean, all it does is spin right?) needs a little explaining. Here are two nice videos on how it works and what it is good for.
My one tip: When using the Dremel as a rotary saw, move against the spinning blade; it stops the tool from skittering.