Five blog posts about GPS tracking project "UrbaDiary" that looks at the spatial extension of peoples habits in the city environment. Fourteen participants are tracked with GPS to record their movements. Google Earth is used as a visualization engine for animating the data, maps and graphs complete the picture.
There's much more than just the above image, with 3D generated animations showing routes superimposed over maps of London. In fact, let me just embed one below to give you an idea.