Photographer R. Gardiner has superimposed a geographically accurate Tube (subway) map over a NASA satellite image of London. Why can't the maps on the Underground look like this instead of this (PDF).
The current map was originally designed in 1933 by Harry Beck - an electrical engineer who based the map on a circuit diagram (Flash).
Other links today:
Annie Mole's Going Underground blog
Essential reading to make your daily commute more bearable.