CloudMade – Makes Maps Differently
http://cloudmade.com/

CloudMade helps you make the most of map data. They source their maps from OpenStreetMap, the community mapping project which is making a free map of the world. Their aim is to continue the democratization of geo data and to expand access to open geo data through a range of simple yet powerful tools and APIs. Their tools and APIs allow developers to create rich interactive experiences on the web and mobile. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.