A few TEDs ago, [The Technology, Entertainment, Design Conference] John Brockman began hosting an annual Millionaires' Dinner in honor of his acquaintances at the conference whose net worth exceeded seven figures. But rising equity values prompted Brockman to rename his party the Billionaires' Dinner. Last year, Steve Case, Jeff Bezos, and Nathan Myhrvold joined such comparatively impoverished multimillionaires as Barnes & Noble's Steve Riggio, EarthLink's Sky Dayton, and Marimba's Kim Polese. The dinner party was a microcosm of a newly dominant sector of American business.