The "heaviest and most powerful telecommunications satellite ever launched" was yesterday carried aloft atop an Ariane 5 ECA lifter from the European Space Agency's Korou spaceport in French Guiana.
More: http://www.theregister.co.uk/2009/07/02/terrestar_1_launch/
The world's biggest commercial telecommunications satellite has been put in orbit by an Ariane 5 rocket.
The TerreStar-1 platform weighed just shy of seven tonnes at launch.
More: http://news.bbc.co.uk/1/hi/sci/tech/8129546.stm