well, the big problem with increasing the pixels in a chip is that you also are increasing the noise. It's not so apparent in professional quality cameras with their physically larger chips, but the tiny chips in point and shoot cameras are really susceptible to this problem. At this point, I think anything over, say, 8 megapixels in a point and shoot actually becomes a liability because of all the noise.
The industry really needs to work on the noise problem.
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