Mars Rovers
If you do not remember, on January 3rd 2004, a tiny rover named Spirit landed on Mars. On January 24th 2004, another tiny rover named Opportunity landed on mars. Each of these tiny devices, used to study rocks on mars, was scheduled to last 90 days, and the mission was designed around that time line. You would think such devices would last a month or two, being very mechanical devices running on batteries and solar power in a very foreign environment.
Amazingly enough, both devices are still up and running. Today Spirit will reach its 600th active day on mars (opportunity will reach day 579). Think of that for a second, a remote control robot being 35 million miles from us here on earth, running on unknown landscape for over a year and a half.
I think much credit is due to the NASA folks that have managed to make this happen. The media has stopped keeping track of the mars rovers, which I think is a disappointment, as I think it is an amazing story. Who would have ever thought these devices would still be up and running.