Soma Cubes are made of all 7 shapes you can make by gluing 3 or 4 cubes together (face to face lined up) so that you get something other than a rectangular solid.
The point is to arrange them in to a 3x3x3 cube.
There are 240 ways to do this (not counting rotations).
some info on soma cubes: wiki/Soma_cube
some more info: games/soma.htm