At the risk of sounding all "me too"-ish, Phillip Howard's overview of Kalido
sound a lot like what I had in mind as the top-most piece of the Data Management System
I described a few months ago. Kalido's technology, or something like it, on top of a query router a la ParAccel, combined with an ETL tool and a database engine or two and viola, Data Management System.
I wonder who will be the first to put the pieces together...