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Palo Alto-based E-Stamp Corp. said it expects the U.S. Postal Service to approve its Internet postage technology by the fourth quarter of this year. The start-up has developed a product that would enable consumers to purchase, download, store and print postage using a personal computer. . . . Shares of Carpinteria-based Benton Oil & Gas Co. began trading on the New York Stock Exchange under the symbol BNO. Benton’s shares had been trading on the Nasdaq Stock Market under the symbol BNTN. . . . Redwood City-based Sega of America, a unit of Tokyo-based Sega Enterprises Ltd., said it picked the San Francisco office of Foote, Cone & Belding to handle the company’s video-game console advertising business in the U.S., an account worth $15 million to $20 million this year, said the agency, a unit of Chicago-based True North Communications Inc.