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Light on Weight; Long on Power These systems from Compaq and Gateway come with huge, 14.1-inch screens and keyboards that stretch from here to eternity, but both weigh less than 7 pounds.   Businesses Embrace Instant Messaging Instant messaging (IM) isn't just for AOL chatters anymore. Businesses are discovering that IM boosts productivity and makes collaboration easier--but beware of viruses and unexpected attachments.   Alternative Autos We've been hearing about futuristic cars for decades. On the streets of San Francisco, we found the cars of tomorrow being driven today.