Across America on Friday, people lined up for blocks to buy an incremental update to an established product. In the gadget market, that's not ordinarily rational behavior.

But Apple's iPad and the iPad 2 that arrived in stores Friday are not ordinary gadgets.

The first woke up a tablet-computing market that had been occupied only by heavy, slow devices running versions of Microsoft's Windows operating system. The second, priced at $499 and up like the first, doesn't do all that much more: It's a lot thinner, a little lighter, has a faster processor and adds two cameras.

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