At the Ipex show in May 2010, I spoke with a man who was involved with a company where they digitalized ordinary books. Scanning with a conventional scanner took too long, so they photographed the pages instead.
They had designed a mechanical automatic page turner, which flipped the page between each picture. Then in the rig there was a 1Ds Mark III taking photographs of each page. This camera, sitting perfectly still in a rig, just taking picture after picture (each picture was sent to external storage as they were taken) had a very nice life, of course. No bumping or rough handling.
The shutters lasted about three million exposures. After that, they were worn out, but the camera still looked like new, so they had the shutter replaced and kept on going.
This is the longest shutter life I've heard about, but it's of course not at all the kind of life most of our cameras live.