The Blended Wing Body was actually developed by an aircraft manufacturer named Burnelli back in the '20s. Burnelli conceived the idea that an aircraft would have greater lift and structural rigidity if its fuselage were to be blended with the wing. Also, the Burnelli design was much safer in a crash, with the outer parts of the wings used to cushion impact and allowing the large, square cabin to remain intact. A Burnelli plane which was crashed showed remarkable strength and rigidity in its passenger cabin.
Burnelli's aircraft flew in small numbers until the early '40s. I've read that the technology was deliberately suppressed because of the huge impact it would have had on the aircraft industry in the area of design. In effect, Burnelli could have caused all aircraft manufacturers using the typical fuselage layout to fall FAR behind in technology, which was unacceptable. So like Preston Tucker, with his revolutionary Torpedo car, Burnelli's designs were shelved and the company forced out of business. No other aircraft manufacturer besides Northrop has made use of Burnelli's lifting body ideas to this day.
Do a search on Burnelli on the web. I've seen the site; it's really an amazing story, and contains many pictures and drawings which should prove to be really interesting.