My cloud

Wouldn't it be useful if we could easily setup and connect a computer to the Internet and have it support a private cloud with collaboration applications for instant-messaging, email, document editing, etc?

In my opinion, one of the problems with current cloud computing is that you have to rely on a trusted third party to keep your data safe and secure. In most cases, trust is based only on a leap of faith. But what about critical applications? Would you trust your keys to Google/Yahoo/Microsoft/Amazon/etc?