Got the change to test my web software based on the Radar Box an hour ago, when SAS Boeing 737 came to my city, Kristiansund. Heavy windows put them into trouble, so my flight log got the change to show me some nice results.
Take a look at this.
http://www.mrt.as/fw/flightwatch.php?day=06&month=01&year=2009&zoom=9&callsign=CNO2303&map=normal&modes=47836EThis is the humpy approach. My software stores all the data, and make such maps for the traffic around here, and the system is open, so other users can easily connect to, and get similar results for their airports. Take a look at the pages, some more information about flights, statistics and more is also integrated.
There is also a mobile phone version.
http://www.mrt.as/fw/mobile/map.php?day=06&month=01&year=2009&zoom=8&callsign=CNO2303&map=&modes=47836EThe same flight on your mobile phone (nice when out spotting, waiting at the airport and so on). Send me a message if you want this service for your local airport.