So Flightradar24.com is the coolest thing I’ve seen so far today (granted, the day is young). It’s exactly what it sounds like, a mashup of google maps and flight tracking in real time, allowing you to see as planes move across the map (I assume this is all projected data based on departure / arrival times and not true “real time tracking”). Very cool. Want to freak out? Zoom out over Europe and see how England basically disappears completely under a mass of aircraft.