I am always amazed at the ability to manipulate the video feed in real time to put things into it that aren't really here. The billboard ads always amaze me. But what they are planning for the America's cup astonishes me. Back computing the position of a helicopter video feed so that surface features on the water remain stationary [1] its going to be pretty wild.
[1] http://www.youtube.com/watch?v=fh3ZB8xNrRg&feature=playe...