It's hard to buy a laptop computer today that doesn't come with a Wi-Fi chip: a built-in radio that lets users surf the Web wirelessly from the boardroom, the bedroom, or the coffee bar. People love Wi-Fi because a single base station -- a box with a wired connection to the Internet, such as a DSL, cable, or T1 line -- can broadcast to multiple users across distances as great as 100 meters indoors and 400 meters outdoors. But there's a new technology standard on the way that will make Wi-Fi look feeble. It's called WiMax, and it provides wireless broadband Internet connections at speeds similar to Wi-Fi's -- but over distances of up to 50 kilometers from a central tower.

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