Looks like Sun's Project Blackbox project has a little competition -- Rackable Systems has introduced (and is shipping) the Concentro. It's a data center in a 40 foot shipping container. It's tailored to Rackable's server products, with half depth racks and a custom DC power system, but it's intriguing none the less. With all the hype around "containerized" data centers, I'm pretty sure we'll see a few others join the fray.
Whatever happened to Google's rumored container project? Was that the genesis of Project Blackbox, or were all of these companies secretly building these things at the same time?