I was finishing some sample I had to do when I thought it would be a nice idea to show my lame-but-extremely-useful animation lightbox:

It's made of crappy cardboard box from a bulk cd order I had (all cut to my purposes), plus a broken glass (sharp edges covered), and an important ammount of duct tape. It's a tilted glass surface to draw in, that gets light from below (it's filtered through a translucent plastic to blur it a bit) so you can see the drawing in the sheets below. Its traditional use is for animation, but I use it more for standard drawings, that way I can have separate layers for background and objects, etc.