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Web 2.0 was hot last night. And I mean the kind of heat determined not by Technorati rank, but by the thermometer. Despite the stifling weather, San Francisco's Web stars turned out for a party Sarah Lacy threw for her new book, Once You're Lucky, Twice You're Good at Otis off Union Square. The hole-in-the-wall, two-story bar couldn't handle the crowd, which spilled out on Maiden Lane. Slide CEO Max Levchin, the star of the book, stopped by with fiancé Nellie Minkova to congratulate Lacy, and then immediately left. Runner-up Jay Adelson, whom Levchin beat on page count, stayed longer, as did Twitter's Ev Williams, who came with his wife, Sara Morishige. Also in the crowd: August Capital VC David Hornik, who didn't even rate a mention in the index, despite inviting Lacy to his exclusive Lobby conference. A gallery of photos, after the jump: