In a busy Seoul subway station, there is a huge interactive billboard from Nikon advertising the D700 Model. As people walk by, it activates the interactivity on the billboard with a mass of paparazzi's with D700 cameras with flashes taking pictures of the people. An extremely creative way to grab attention to the product.

If you travel a lot, you will start to see more and more interactivity within billboards as companies compete for your attention by finding newer ways for the audience to participate with the messages. From mobile interactivity to real time streaming video, whoever thought that billboards will break the old rule of 3 seconds of eyeball attention and start to average more than 10 seconds of view time?

There are a lot of great ones out there. What cool billboards have you come across?