Japan's Sony Corp. plans to launch the world's lightest 8-inch notebook PC, taking aim squarely at a rapidly growing market for ultra-portable personal computers.

The new 1.4-pound Sony Vaio PC will come with Microsoft's Windows Vista operating system, supporting all the software programs found in full-sized notebooks. It will sell for about $900, setting itself apart from netbooks.

Netbooks, pioneered by Taiwan's Asustek in 2007 and one of the rare bright spots in the electronics industry in recent months, are generally described as low cost, mini-laptops optimized for Internet use, and sell typically for $300 to $400.

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