Ready or not, here come the 'tweeners. Palm and its Foleo are just the latest evidence that the electronics industry is determined to create a new category of mobile computing devices. Samsung Group, Sony, Nokia Corp., HTC, Fujitsu, and Vulcan Portals have also introduced or previewed products that are smaller than laptops yet larger than smartphones. The idea: offer businesspeople something very small—pocketable, in some cases—that's an alternative to carrying a laptop around town or on a short business trip.

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