Six sided die with each side made from a gear with a number sitting in the middle. Each gear is attached to an axis inside the die. Recently added diagonal sticks to discourage it from landing on a corner.
Another die made with a gear for each face and the number inside that gear. In this one the gears are attached to each other by intersecting teeth and they cannot move, but it still looks cool if you ask me.
Round six sided die. I honestly don't see any way to use this as a real die, since it doesn't have any flat faces to land on, but it looks interesting.
Six Sided die with the numbers represented by the first six elements on the periodic table, Hydrogen, Helium, Lithium, Beryllium, Boron, and Carbon. Also includes shell diagrams for each element.
Know someone who's a 20? Keep a little (1.5 cm by 1 cm) photo of them inside this 20 sided die necklace. Comes in two parts. Pass your chord through the hole in the top half, through the loop inside the bottom half, and back out through the hole again. The loop is attached to a platform where you can glue picture.
Four, six, eight, ten, twelve, and twenty sided dice with gears surrounding each number. The gears do not move.
The sizes have been adjusted so that they match each other better than for the individually sold dice. The larger dice have been reduced and the six sided has been increased. These are no longer available in metal due to concerns over wall thickness.
Six sided die with outlines of chess pieces imprinted on the sides. Small, single version of the full color pair (http://www.shapeways.com/model/250768/chess_die__pair_.html?gid=ug) not available in color or steel.
Six sided die broken up into five pieces for you to reassemble. If you don't get this in the polished material I'd recommend sanding the peg piece before assembling it the first time.