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It turns out the gambit was a savvy business move. In the first month, about a million fans downloaded In Rainbows. Roughly 40 percent of them paid for it, according to comScore, at an average of $6 each, netting the band nearly $3 million.

Thanks to Gillette, the idea that you can make money by giving something away is no longer radical. But until recently, practically everything "free" was really just the result of what economists would call a cross-subsidy: You'd get one thing free if you bought another, or you'd get a product free only if you paid for a service.

Even if you could never justify spending $360 on a Kindle, you can still partake in the mobile eBook revolution. Amazon Kindle for iPhone & iPod Touch (Free) is a new app that lets you buy and download Kindle books and read them on the go — without buying the Kindle 2. In addition to having access to more than 240,000 books, the app lets you adjust text size, add bookmarks, and get free samples. If you already have a Kindle, the app’s Whispersync technology saves and synchronizes your bookmarks across your Kindle and your iPhone.

Leapfroggingmeans to jump over obstacles to achieve goals.

This process marks an extension of Vygotsky’s and Dewey’s work, while ever looking toward the future.

One example of Leapfrogging is Finland’s jump to wireless phones, saving that country the cost of deploying an expensive copper wire system.

Professors are beginning to use Twitter at academic conferences to share proceedings with absent colleagues and to create an online “backchannel” for attendees, but the tool can also be distracting and detract from face-to-face communication at events.

The report shows that mobile technology is becoming the most desirable means of communication -- especially in poor countries. The numbers show dramatic growth: By the end of 2008, there were an estimated 4.1 billion subscriptions globally, compared with roughly 1 billion in 2002, according to the International Telecommunication Union, one of the specialized agencies of the United Nations. The study also looked at the Internet, and found that worldwide, usage has more than doubled: Approximately 23 percent of the population uses the Internet, up from 11 percent in 2002. Still, poor countries are far less likely to surf the Net. For example, only 1 in 20 people in Africa went online in 2007.

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