As soon as you start using multiple networks, you’re in the cloud, because now you’re making use of resources that are outside the control of your own IT organization and your service provider. Whether people think about it or not, just by adding a second network, they’re taking their first steps into the cloud.
Anybody who carries a smartphone is experiencing the personal, private, public boundary of operations themselves. But what seems natural to somebody carrying an iPhone or Blackberry is a tremendous challenge to the traditional models of IT.