Whilst playing with this and that, I came across an article about picking up ads-b transmissions from aircraft in my vicinity.  I had a Raspberry-pi computer on hand, a spare RTL dongle, and some bits of wire that I could fashion in to a 1.090 Ghz antenna, and voila!  Plane data!  I'm feeding my info to FlightAware, which combines it with other data sources, including many other hobbyists around the world, to present flight tracking data and maps.  Note:  I'm not personally seeing ALL these planes - my data is part of the stew...

click here for the map...