Via the Bike-sharing blog, an animated video of "Boris Bikes" (as the BIXI bikes in London, UK have been nicknamed after Mayor Boris) by Dr. Martin Austwick at the Centre for Advanced Spatial Analysis - University College London - being used in one day when the London tube was on strike.
As mass transit goes, one can see the expanded possibilities for short trips over a wide area.
The map geeks at the Toronto star have outdone themselves with this google map of Commuter cyclists by census tract (a small area as defined by Statistics Canada's census). It shows the breakdown of how people commute who live in that area. The census tracts with red boundaries are over 10%.
This is my third map mashup. It compares the share of commuters who are cyclists with the location of Toronto Cyclists Union membership. The map shows that the richest deposits of potential bike union members are where there are already a high number of cycling commuters.
It may come as no surprise that bike shops are located where people bike.