Here are some gizmos that while useful, no one would use them (I'm sure)
http://thenonist.com/index.php/weblog/permalink/chindogu/
Reminds me of the inventor show that what on recently.
More info re. sudoku -- I mean chindogu...
http://www.stim.com/Stim-x/0796July/Phenom/chindogu.html