Sydney, Australia - OpenStreetMap GPS Map
Using the recent GPS Bulk Data release from OSM to render large area maps from just GPS points (no vector info - a cloud of points)
As well as showing up roads, a number of ferry routes are also visible (roll mouse over for annotation)
Data copyright OpenStreetMap and its contributors, CC-BY-SA
Inspired by this map of Glasgow
Rendered in QGIS and Inkscape.