Is there some correlation between card shuttling and reliability? It seems to me that a number of stories I read about card failure are coincident with having moved the cards in and out of cameras.
The story above of how a card was corrupted by simply moving it between brands is disheartening.
I bought a Kingston CF 16GB elite pro 133x card when I bought my D700 almost three years ago. So far, no problems with it. But I transfer the data with the USB cable, not with the little card reader gizmo which I bought and have used but once since. I read about how that some folks were bending pins in their cameras by mishandling their CF cards, and decided that there is no reason to take that risk if I'm not in a big hurry to move data about.
I have also wondered about putting one's CF card into some other device. Consider those photo processing kiosks in stores. What with people coming and going all the time, how can one know the health of those slots and the pins at the dark end of them? If one puts his CF card into one, is it possible that a fatigued pin might break off inside one's CF card? Then, if not noticed, it seems to me that one might unknowingly bend pins in his camera when trying to reinsert the same damaged card into his camera.
I've reasoned that if I don't move the card, then I don't run those risks. And besides, the storage capacity of a 16G card is far greater than any roll of film I ever shot. I will get a second card as a backup, but I am not yet inclined to swap the two in and out all the time if I can avoid it.
Frankly, I think the form factor of the CF card is flawed. Terminal equipment, whether telephony, audio, video, or photo, should not have pins for connectors inside the endpoint equipment. That should be inside the cables, which are easily replaced. The phone company had this right all along, but the data industry popularized the bad habit of doing it wrong. The cards which have no pins and no need for them seem like a better idea to me. Like those little cards that go into your cellphone, for example.