I believe the is Northrop Grumman's X-47B J-UCAS Aircraft, or JOINT UNMANNED COMBAT AIR SYSTEM, a stealthy drone designed to demonstrate the feasability of weaponized unmanned aerial vehicles. The program was recently scrapped in favor of a new generation of long range strategic bombers.
http://www.darpa.mil/j-ucas/X-47/gallery.htm
http://www.popsci.com/technology/article/2010-03/boot-process-complete-awaiting-command