Silicon Beat -- OpenTable, the San Francisco-based developer of an electronic reservation booking system for restaurants, moved closer to pushing its proposed initial public offering out the door Tuesday when it estimated a price range of between $12 and $14 per-share price for the 3 million shares it plans to sell the public for the first time. At the high end, the offering would generate $42 million. About half of that would go to current shareholders selling some of their own stake in the IPO.