Mark Noad updated Harry Beck's Tube map and it all kicked off.
I rather like it. In fact I love it. As a cyclist it makes COMPLETE sense to me. But then my mental map of London is actually based on real distance rather than abstractions.
More tube map stuff here: http://goo.gl/E85e9
and Matt Somerville's awesome AWESOME live tube map mashup is up and running again these days: http://traintimes.org.uk/map/tube/
Finally there's another nice post about the tube map back-story by Hannah Thompson over at Creative Data: http://www.creativedataprojects.com/2011/06/what-does-londons-tube-map-really...