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This has never been a risk before, but it's now possible to buy too much digital camera. How? It's all a matter of megapixels, short for ''millions of picture elements,'' the standard metric for the sharpness of a digicam's photos.

Three megapixels is the effective minimum for photos that will look good in most printouts. If you think you're going to get a lot of 8-by-10 blowouts, four or five is the minimum. But think carefully about going beyond that; seven megapixels won't make your 4-by-6 prints any sharper, but each picture will take up a lot more space on your camera's memory card and your computer's hard drive.

Source: Rob Pegoraro
Of The Washington Post

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