Barry Diller's restless, 47-year business career is yet again taking a new turn. After a dizzying run from mailroom to studio mogul, he quit his high-flying Hollywood career 15 years ago to plunge into home-shopping television and the Internet. Now, after years of defending his Internet conglomerate, IAC/InterActiveCorp, Mr. Diller broke apart the company six weeks ago, explaining it was too complicated and in too many diverse businesses. His remaining operations include the advertising-supported Web sites Ask.com and dating service Match.com. In an interview, Mr. Diller talks about the new IAC, the effects of the bumpy financial climate and why he'd never return to running a major movie studio.