The Contemporist recently covered a two-family prefab in Austin, TX.
model: The Annie Residence
According to the architect's website:
The house is constructed of a modular steel frame. The frame is infilled with prefab thermasteel panels to minimize construction on-site waste. The structural frame is exposed, showing the construction process and articulating the house’s facades. The repetitive modular method, as well as the prefabrication allowed for greater efficiency during construction.
pictures ... though the Contemporist post has a nice selection that loads faster
Chinese magazine article in Vision May 2007 (PDF)
We also found a video (2:00) showing some of the construction details.