The next steel shipping container you see being hauled by a truck or train might not stow the usual mass of lumber, textiles or foodstuffs. It might hold 10 tons of finely interlaced computer servers, ready to be deposited in a parking lot to serve 10,000 employees at a corporate headquarters—or 10,000 people on the Internet. Sun Microsystems has just started delivering these data-centers-to-go, taking the concept of portable computing to a whole new level.