NextBus uses GPS to tell you the predicted time of the next bus. Google maps show buses in real time, and you can get updates on your phone/PDA. The coverage is limited to certain agencies within the US, so these other sites might be useful: Hopstop covers subways and buses in NYC, Boston, Chicago, San Francisco, DC, and more. (mobile version) Google Transit has many US metro areas in addition to Canada, Europe, and Japan. (previously) Many more locations inside. [more inside]
The Future Generator at the London Transport Museum is a forecasting look at the effect of transport on climate change in London. But you can get a sense of history as well. The museum's collection originated in the 1920s, when the London General Omnibus Company decided to preserve two Victorian horse buses and an early motorbus for future generations. They moved to the present location in 1980. Londoners can take a trip back in time on the Metropolitan line and enjoy a special day out in Metro-land as two historic electric trains run special excursions on Sunday 14 September 2008. [more inside]
London Underground Warning - very bad language and 750k but well crafted critique of the state of the transport system in London.