Bitcoins: The World's First Decentralized, Digital Currency

Bitcoins are a fascinating foray into an alternative, decentralized, online economy. I don't know that they will become a major force in the world economy, but for what they are, they certainly seem viable. I suppose the next step would be making Bitcoins available on your smartphone, so that you could spend them at a brick & mortar (real-world) store instead of just at online storefronts. But I suspect such an app will not be long in coming...