It appears that Curtiss-Wright Controls Embedded Computing (CWCEC) and Hybricon beat others to the punch with the first public demo of a working OpenVPX system. Demoed at the 2009 MILCOM military show in Boston, MA in October 2009.Video: Industry's first working, interoperable OpenVPX demo at MILCOM 2009
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Shared by Mark Littlefield, Curtiss-Wright Controls Embedded Computing 
Neil Peterson, Hybricon — Nov. 6th, 2009
It appears that Curtiss-Wright Controls Embedded Computing (CWCEC) and Hybricon beat others to the punch with the first public demo of a working OpenVPX system. Demoed at the 2009 MILCOM military show in Boston, MA in October 2009.