https://en.wikipedia.org/wiki/Iridium_satellite_constellatio...
The venture went bankrupt and Motorola was actually on the verge of burning them up in the atmosphere when the Pentagon stepped in: http://abcnews.go.com/Technology/story?id=119255
Another interesting thing about the Iridium Constellation is that the satellites have an unusual arrangement of large, flat antennae. This, along with detailed data about their position and orientation means that they create very predictable flares of reflected sunlight that are quite visible from Earth. You can usually a fairly bright flare every couple days: