The KH-11 United States Reconnaissance satellite is equipped with a computerized digital imaging system that is capable of giving real-time images.  The total weight is 11 tons, and they have been launched into orbit by Titan IIIs dating back to 1976.

They are extremely useful in gathering real-time data for special operations.  The only problem is that after a certain period of time, they run out of fuel, and are not able to maneuver their orbit pattern.  They become fixed on the same orbit pattern, and can only collect data from that range spectrum.
