Maybe it was the edible wafer-paper-and-soy-ink menus or the "sustainable" blue-cheese mousse whipped up by Google's chefs. Maybe it was the full-size replica of the indie commercial spacecraft SpaceShipOne suspended overhead. Or Robin Williams' jokes. Whatever the reason, the hundreds of Silicon Valley grandees who packed the Googleplex one Saturday evening last March were in an expansive mood. They had dropped $1,250 or more a head to benefit the X Prize Foundation, the nonprofit dedicated to...