OpenStreetMap now counts over 1.6 million contributors—for comparison, in 2007 there were 9,000 contributors—and sites like Foursquare and Craigslist use it as well as plenty of developers who make gorgeous things like these watercolor maps by Stamen. The depth and detail of this resource is a testament to the open web, and it's a beautiful thing, indeed. [Gizmodo en Español]