Dat XB-70....It's a real shame it never went into production. One thing I recently noticed.....take away the long front tube with the canards and the plane is really a flying wing design, like the B2! They are totally different aircraft, of course. The B2 was designed for stealth over speed, and certainly didn't have all those monster engines blazing away like little suns and pushing it to mach 3 speed. The Valkyrie was about as un-stealthy as you can get.
But it's interesting, lifting body/flying wing tech is older in US bombers then most people think, especially since all the preliminary work on the concept was done in Nazi Germany.