Remember the tube map with almost-real-time train movements? Visual developer Bruno Imbrizi has gone one dimension better. Using a combo of station depth information, lat/long coordinates and train running information, he's put together this splendid 3-D visualisation of nine Underground lines (Waterloo & City and Circle lines seem to be missing). It's not quite real-time running info, but shows a good approximation of the network when everything's working as it should.
We could waffle on, but the best thing to do is simply head over to his site and have a play.