Did someone change the title of this thread for some obscure reason?
Heathrow PRT System
Anyway, another world first; the world's first proper Personal Rapid Transit system. The first stage network (3.8km - 80% elevated) linking a northern car park to Heathrow Terminal 5 is now complete and passenger operation due is to begin in Autumn 2009.
The below video shows a visualisation of the network and at 03:15, the eventual planned network that will criss-cross the airport area connecting periphery car parks, hotels, stations and terminals into one giant convenient network spanning some 80km (tunnel, and elevated).