Last month, much buzz on the media beat centered on New York Observer TV scribe Rebecca Dana jumping to the New York Times. What started as a rumor on Radar.com turned into reality with this memo issued by the Times' Larry Ingrassia. Her start date was supposed to be this Monday (Jan. 29), but sources inside the paper say she's changed her mind and decided to stay at the Observer. Calls to Ingrassia and Dana have not been returned. Developing….