Why Megapixels don't matter

Just in time for Christmas, here is an article that explains why bigger isn't always better. Apparently, regular people can't tell the difference between rated megapixel ranges.
Tech writer David Pogue took photos with 5, 8 and 13 megapixel digital cameras, had them printed and blown up to 16 x 24 inches poster size, and asked passersby to pick out which ones came from the higher res camera:

Dozens of people stopped to take the test; a little crowd gathered. About 95 percent of the volunteers gave up, announcing that there was no possible way to tell the difference, even when mashing their faces right up against the prints. A handful of them attempted guesses--but were wrong. Only one person correctly ranked the prints in megapixel order, although (a) she was a photography professor, and (b) I believe she just got lucky

http://pogue.blogs.nytimes.com/2006/11/21/21pogues-posts-2/