Flight Tracking
 

There are a couple of flight tracking tools. The only one I'm really aware of is Flight Aware.

http://flightaware.com/

You can enter a tail number, or type of aircraft, or airport, and see all the flights in progress. If you enter a tail number, you can see the most recent flight of that aircraft.

http://fboweb.com/s/tr/qt2.aspx

I have used fboweb before. They have some neat features like 3D tracking. This is a site for FBO's.