An interesting extra dimension to mapping

Brady Forrest points out some funky Flash-based maps from MySociety, integrating geographic data (house prices in London localities) with time (travel times from those locations to central london). Actually it's two sets of geo data, because apparently the times are calculated already and assigned to localities, but in any case it's a nice app. Not quite "representing time" on a map as BF suggests, but rather an example of how time and geography intersect.