"The cloud" isn't some nebulous thing existing just beyond our computer's consciousness. As Microsoft showed us, it's stacks of hard drives packed into shipping containers, parked in secret data centres all around the world. Physically real, but still beautiful.
You should get the basic concept: Networked storage with hot-swappable drives. Take that idea, extend it to power and cooling, and multiply it by thousands of drives, and you get what Microsoft is deploying for its cloud services - be it Exchange Server or Bing or Office 2010. It's a shipping container that's a fully self-contained server system. And true to its modular design, it can also be one piece of a larger network of servers, that can be set up anywhere, in a hurry.
The portability isn't the only thing that's relatively new: These systems used to require a fire hose to cool them down, but now they have a garden hose, and the water is only needed when temperature rises above normal operating temperatures.
The data centre in Chicago, shown in pictures and video here, went live mid-2009 and when completed will cover 65,000 square metres, demands 30MW of energy, one day reaching 60MW. Microsoft is exploring alternatives to power from the grid: A similar data centre in Quincy, Washington uses hydro-electric power, 27MW worth. Here's how the Chicago centre was "built":
Quite a few controlled facilities, even if Microsoft won't say exactly how many. What's sure is that the number is getting bigger. Judging by this viddy, the global deployment process can seem a little like Dr. Evil trying to take over the world, or at least you trying to win a game of Risk.
Memory [Forever] is our week-long consideration of what it really means when our memories, encoded in bits, flow in a million directions and might truly live forever.