Just remembered that I found Donald Trump on this a while back - he was flying in to my home city of Aberdeen:
http://blog.mclemon.cz/i-found-donald-trump-in-flight-radar-...
http://blog.mclemon.cz/i-found-donald-trump-in-flight-radar-...
The site itself is fantastic though, I could spend ages just finding out what planes are going where and thinking about where I might visit next. Plus the coloured trails to indicate the altitude are a lovely touch.
edit: it was during this time (excellent clip, by the way) http://www.thedailyshow.com/watch/thu-april-26-2012/hairland...