There are many Cybershot Users and potential users who still don't know the difference between 1 Megapixel, or 2 or 3. This chart shows the differences and can be used fairly accurately to help decide what your needs are for your next purchase.
||640 x 480
||4 x 5
||1,280 x 960
||5 x 7
||1,600 x 1,200
||8 x 10
||2,048 x 1,536
||11 x 14
||2,272 x 1,704
||2560 x 1920
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Check out: Shutterfly.com and Ofoto.com.
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BestBuy.com's megapixel explanation