OK, so I have put together such a network. It's foolproof with NAT traversal and easy to use because I've integrated it into a portable OS. But I'm a do everything with netcat sort of guy and so I haven't written any sexy and compelling "apps" to run on it. Others would have to do that. My question is: What is the market demand for this? I mean, a few HN'ers say they want it. But that does not make a startup.