The venerable Newsweek magazine was sold by the Washington Post this year for one dollar. The buyer was 92-year old audio-components maker Sidney Harman, who also picked up $47million in liabilities. Now Newsweek has joined up with the two-year-old website, edited by Tina Brown. The Daily Beast needs credibility. Newsweek needs new media energy. Can Brown accomplish the synergy to keep them both alive? Steve Fishman is contributing editor at New York magazine.