Interesting discussion that seems to have gone on a while!
I take photos in order to place them into various libraries as well as magazine work. In the case of the former, it doesn't bother me too much if somewhere has been photographed to death as if I haven't done it then I'd like to add it to what I have in the libraries.
For example, in just over a week I will be photographing the far north of Scotland including Skye. How many times has this island been photographed? Countless times! How many of those people going there are actually trying to do something with their photos? The percentage is less and this is why it doesn't bother me too much.
Another example is Paris. I've been three times this year to photograph the city. A city that must be one of the most photographed in the world. However, just over a week after a took a bog standard image of the Eiffel Tower at night I'd sold it through Getty Images to MSN news