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Whither lies the true "doorway" to the Web 2.0 world? The search for this golden portal into the future Web has launched a mega-billion-dollar corporate competitive scramble with no complete solution in sight -- yet. Portals come in three basic varieties: horizontal portals like Google and Yahoo, vertical portals like WebFlyer and WebMD, and affinity portals like iVillage and Realtor.com, according to a study of portal business models by the University of Washington's School of Business.
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