TileMill Opens Up a World of Mapping Possibilities With OpenStreetMap
One of our favorite collaborative open data projects is [OpenStreetMap](http://www.openstreetmap.org). We’ve [talked before](http://mediashift.org/idealab/2010/10/openstreetmaps-audacious-goal-free-open-map-of-the-world288.html) about the project’s goals, how its free…