I came across this amazing game case for the Nintendo DS in an odd place. David Friedman has a profile and photo shoot with the inventor on his photo blog.
The game case has a unique feature that solves a problem that we've really struggled with. You can only take one game at a time out of the case. To get a new game out, you have to put an old one in. No more empty game cases. No more finding DS games all over the house. No more missing games. (Unless you can't find the case.)