Skunk Works - Ben R. Rich & Leo Janos ISBN 0 7515 1503 5.
"Skunk works is the true story, told for the first time, of America's most secret and aerospace operation. As recounted by Ben Rich, the operations brilliant boss for nearly two decades" (off the back cover)
OK I'm only a third of the way through it but it's making the commute go considerably faster. The book's also been highly recommended by a couple of pals.
Also recently finished "Propeller Head" as noted above, a fun read.