This is just the coolest gadget! Heavens, we've got at least a dozen of these little tins around the house ourselves.
Throw a 9v battery into the Altoids tin and you've got a quick charge for any device that can charge through a USB port.
The best part is Aaron is selling the parts for building this from his site for a very reasonable price.
Even though I don't think I have any devices that would use this, I'm tempted to pick one up to support the effort and, what the heck, just in case.
Isn't it nice to know that there are people out there thinking of these kind of things?