According to this article Boeing seems to be ready for BWB design. They want to try it out with freighter companies. I don't know how serious they are with this project. Anyone knows?
http://www.flightglobal.com/articles/20 ... -body.html
Boeing works with customers on BWB
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Picture Nov.2006 courtesy of

They are working on it since years, but very few accurate info can be found.
As far as I know, US Air Force and NASA are participants.

EDWARDS, Calif., Oct. 27, 2006 -- In cooperation with NASA and the U.S. Air Force Research Laboratory, Boeing [NYSE: BA] Phantom Works soon will begin ground testing of its X-48B Blended Wing Body (BWB) concept in preparation for flight testing early next year.
The X-48B ground and flight testing will take place at NASA's Dryden Flight Research Center at Edwards Air Force Base in California, where two high-fidelity 21-foot wingspan prototypes have been delivered.

This project also illustrates how Boeing develops future aircraft through tax money.