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Within two to three years, though, WiMax's beam might also track a special chip in wireless devices, Richardson says. The beam won't move at the speed of a car, so it might be tough to check e-mail while driving, says Yuanzhe (Michael) Cai, an analyst with emerging technology consultancy Parks Associates in Dallas. Still, that would only cause accidents, anyway. The technology would be best for a mobile worker who wants to check e-mail during a stop at a gas station. The combined market for 802.20 and WiMax hardware should reach about $1.5 billion by 2008, according to ABI Research, a tech consultancy in Oyster Bay, N.Y.