The Metropolitan Philadelphia Indicators Project released an online map, MetroPhilaMapper which allows to easily map over 300 indicators for the region, including land use patterns, population characteristics, school district spending and performance, income and wage data, and crime patterns.
There are now two sites that offer download of from OpenStreet in varying formats, including shapefiles and GPS: CloudMade and Geofabrik (for Europe).
Schuyler’s Lightning Talk on public access to geodata given at the FOSS4G conference in Cape Town. For your viewing pleasure. And here is a summary of the events.