London's tube map is already super cool. It's extremely functional because it is layed out as a schematic rather than being layed out geographically. It is a marvel of design, and I love it, and it is very usable.
Then this guy comes along and thinks up something super brilliant. Take the tube map, and keep the schematic rather than geographic feel, but have the space between the stations on the map be accurately representative of how long it takes to travel between the stations. That's amazing. I wish I had a map like that when I was in London.
Now all that needs to be done is for the map to be printed on e-paper, and then the lines between the stations stretch and squash in realtime as traffic varies the trip times.
That'd be the awesome.