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WEB 2.0 SUMMIT — Is preternaturally tan conference organizer John Battelle, who runs online-ad network Federated Media, here to interview top industry executives — or cut some deals of his own? "There's this idea that you can sprinkle some pixie dust on all this inventory and make more money," he observes, speaking of the mass of Web ads sold at bargain-basement rates. AOL's Curt Viebranz says that ads sold on Tacoda — the startup he just sold to AOL for a reported $275 million — sell at a $4 cost per thousand viewers. When he hears that figure, Battelle raises his eyebrows and asked Viebranz to talk to him after the panel.