While traveling, I usually hide little stashes of cash in various places in case I get mugged or robbed. The one time my money belt was stolen, I had enough cash spread about that I was able to survive for a couple of days before getting my traveler checks replaced.
A cool little product on the market right now provides just one more place to hide your cash. The StashCard is a tiny compartment that slides into the open slot on your laptop and disappears.
Of course, hiding cash in your laptop is a bit like hiding money in your expensive camera; a thief will often steal your electronics faster than your wallet. Nonetheless, I still think it is rather cool. Even if you decide not to use it for emergency cash, the StashCard is also large enough to hold credit cards, memory cards, keys and more.