Here is a very short article on flying wing history. Many books have been written on the subject.
http://www.wpafb.af.mil/museum/fta/fta198.htm
Jack Northrop first began work on a flying wing design as a young man in the 1920s. He and his company designed, built and flew several different flying wing aircraft in the 1940s and 50s. Ultimately, none of them were put into production due to a number of technological challenges which were not surmountable until many years later with advances in electronic technology. Others continued his work though. Eventually, the wing WAS produced and flies today as the B-2 Spirit stealth bomber.
Before his death, Mr. Northrop lived to see a secret protptype B-2, which eventually became the only flying wing aircraft ever to be produced or be operationally deployed. Arguably the most expensive airplane ever to be produced. I do not expect to see this type of design produced for airline service any time soon for a number of operational, technical and economic reasons. But the real legacy of Mr. Northrop and those like him is that someone will in the future be inspired to realize their own vision and advance the state of the art yet further.
Best regards,
Westhawk