Jimmy Fallon to take over "Late Night"

After months of speculation, Jimmy Fallon has sealed a deal to succeed "Late Night" host Conan O'Brien on NBC in 2009, sources said. O'Brien, whose show airs at 12:30 a.m., is moving into the 11:30 p.m. slot next year following "Tonight Show" host Jay Leno's retirement, which was announced in 2004.