Offered for sale exclusively over the Internet, Sony's new "Aibo"--a $2,500 robotic dog that can go for walks, wag it's tail and do tricks--recently sold out in 20 minutes. Why is Aibo so popular?

Offered for sale exclusively over the Internet, Sony's new "Aibo"--a $2,500 robotic dog that can go for walks, wag it's tail and do tricks--recently sold out in 20 minutes. Why is Aibo so popular?

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