Going itself one better, Rackable has removed the system fans from its devices destined for the ICE Cube -- instead, it uses large in-row fans between each rack of servers. The result is less power consumption and improved reliability.
So just how much of a data center is this? The numbers are impressive -- if you pack a 40-foot trailer with storage, you'll get up to 4 petabytes of data. If you pack it with servers, you can squeeze 1,400 of them in -- complete with UPS. If they're quad-core systems, that adds up to more than 11,000 cores.
Unfortunately, you can't just park this thing in a parking lot and run an extension cord and fiber optic cable to it. The cooling system requires an external chilled water supply, and that extension cord had better be a big one. Rackable says it can max out at 750 watts per square foot -- which is a good bit more than even the most advanced data centers. For a 40-by-8 trailer, that calculates out to 240 kilowatts -- BIG cord!
That said, Rackable claims 80% improved efficiency over classical data centers. The uses are what you'd expect. The government is interested (think Defense and Homeland Security), disaster recovery is a good use, peak load handling is a possibility, and the energy industry might want these things on site to analyze seismic data. And the cost -- $2 million to $4 million is a typical configuration.