Read these paragraphs from an article in Wired:

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The great terror in the PC industry is that it’s created a $300 device so good, most people will simply no longer feel a need to shell out $1,000 for a portable computer. They pray that netbooks remain a “secondary buy” the little mobile thingy you get after you already own a normal-size laptop. But it’s also possible that the next time you’re replacing an aging laptop, you’ll walk into the store and wonder, “Why exactly am I paying so much for a machine that I use for nothing but email and the Web?” And Microsoft and Intel and Dell and HP and Lenovo will die a little bit inside that day. Read Further