A bullet proof case is a great idea, especially for the many of us out there who buy all the music we put on our iPod - that little thing is worth a LOT.
Thinking about it there are a few problems with the idea...
1. Weight - With the kevlar around it, the thing would weigh a ton more than it does now, without propper padding between the kevlar and iPod dropping it would DESTROY the iPod from the massive shock.
2. Heat - A Kevlar vest around the ipod would most likely hold heat in, this is not good for the HD, but it could work with the shuffle.
3. Attaching - How would it attach to the iPod itself? Surround it on all sides and snap shut?
If someone makes one of these drop me a message, I want one too. If possible water proof and bullet proof.