GE Energy uses JBoss Fuse and A-MQ in their Software Services Infrastructure for there Smart Grid suite of products.
FAA Next Generation Air Traffic Control System - that uses JBoss Fuse and A-MQ for linking all their existing and new data services together for air traffic control.
The Mars Curiosity - where A-MQ is used to distribute real time information from the ground stations to over 200 associated labs around the globe (including the control centre).
CERN - uses A-MQ for controlling the LHC - and Apollo for distributing raw data from LHC runs to interested labs across the globe.