I have one crazy idea to produce alarm for wallets, as the way it used in automobiles. I offer to install into the wallet a little battery with beeper-tweeter with sensor that looks like little wire connected with your pocket.
When thief steals your wallet for example in public conveyance wallet begin loudly beeping. I think this innovation will be helpful for those people who travel a lot. I'm keen on radio engineering and I had succeeded to do such alarm with 1:10 match box, and I suppose that now it could be done even less.
Also we could install in purses fun stuff. For example when woman open her purse it say - "Dear, don't waste money for this trifle!" ;)