Who Has The Global Edge On Wireless Reading Devices?

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You tell me:

1. Sony Reader
2. Amazon Kindle
3. Barnes & Noble Nook
4. Samsung Papyrus

And there are more here!

How do you determine which company is truly global on the launch of its e-book reader -- by wireless capabilities, number of people using the gadget or the number of different languages available on it or all of the above?