Free Flight Tracking – FlightAware

FlightAware is “A free and powerful flight tracker that will change how you think about flight status, tracking, and analysis.”
Check out this very cool movie … “Animation of all flight movements tracked by FlightAware during a 24-hour period in September, 2005
Live Flight Tracking: “View schedule and track activity for any private (IFR) or commercial flight. See scheduled, enroute, and recent flight activity for any airport.”
via Lifehacker