Story in Aviation Leak: <
http://www.aviationnow.com/avnow/news/channel_military.jsp?view=story&id=news/mbop1021.xml>
The Bird of Prey was, as has been mentioned, an early '90s technology demonstrator. A lot of said technology was incorporated into Boeing's XF-32 prototype for the Joint Strike Fighter--check out the way the XF-32's nose rose to a point, just like the Bird of Prey). The XF-32 lost out to LockMart's XF-35, which had/has similar stealth capabilities but superior vertical takeoff ability in the STOVL version. Bird of Prey technology also lives on in Boeing's X-45A UCAV prototype.
BTW, the Air Force has some pretty hot hardware coming online. The F/A-22 (now in low-rate production?) has approximately the same radar cross section as the B-2 Spirit--reportedly less than that of a duck--since it was designed to be able to escort it into harm's way, and it can cruise at 1.5 Mach with full fuel and weapons load and the afterburner OFF. Even at military power and full loadout, it will reportedly out-accelerate even the uprated F-16's at full AB (F-22 performance in AB is classified, of course). There was a cool article on the F/A-22 in _Code One_ a few months ago. The F-35 has a slightly larger RCS (still roughly that of a duck), but in the Marine STOVL variant can take off vertically like a Harrier, and is supersonic.
The F/A-22 is equipped with an internal gun (see, firearms related, I'm on topic!), and I think the F-35 may carry an underslung gun pod (not sure on that one).
I can't WAIT until these puppies show up at airshows . . .