You, too, can celebrate by visiting London and checking out how it works.
For the home page for the London Transport system, visit http://www.tfl.gov.uk/ There is lots of good information about the transport cards, and the advice to check ahead on the web site to see if the line you are thinking of using is closed for renovation. The 10-year project for updating the lines and the stations is disrupting travel, but we give London Transport kudos for trying to advise travelers in advance for the disruptions.
Here is a great link for travelers: http://www.tfl.gov.uk/gettingaround/15101.aspx
For a nice map of the system: http://www.bbc.co.uk/london/travel/downloads/tube_map.html
Personally, next time I visit London, I am heading straight to the London Museum of Transport. They have an amazing poster collection. Here are details: http://www.ltmcollection.org/posters/index.html.
Do you have a favorite line on the London tube? Or a favorite memory? Love to hear from you.