Geeze. This is the 6th or 7th person that has come up with a "intentional" speculation. Accidents happen and airplanes crash (almost daily). The only reason that this is so big in the media is because it hit a building in a major city.
CNN is reporting that it was NOT INTENTIONAL. The plane was apparently a Cirrus SR20, registered to Yankees pitcher Cory Lidle, and departed from Teterboro airport. His passport has been reportedly found in the street below the accident, and initial reports indicate he was traveling to florida in his aircraft for the off season.
They have also reported that the flight declared a Mayday on the radio prior to impact with an apparent fuel problem.