Open Street Map

• OpenStreetMap - A rights-free map of the world being created by volunteers using copyright free sources and GPS tracks. Includes an interactive map and details of how to get involved.
• Best of OpenStreetMap - Site showcasing the best and most significant parts of the free world map.
• Map Kibera - Project to map one of Africa's largest slums in Nairobi, Kenya. Includes the map, a project wiki, dicussion groups and photos.
• Mappa Mercia - Project to help develop and expand OpenStreetMap in the West Midlands region of the UK. Includes an online map, error reporting tool, details of projects, blog, and how to get involved.
• Open Maps - Blog from Chris Hill detailing his progress with editing and using OpenStreetMap.
• OpenStreetMap Foundation - An international non-profit organisation supporting the OpenStreetMap project. Includes constitution, details of meetings, finances, working groups, and a list of board members and officers.
• OpenStreetMap: Using and Improving the Free World Map - Website to accompany a German-language book about the OSM project. [Some site content in German only.]
• State of the Map - Annual conference about the progress of OpenStreetMap and free geo-data in general. Programme, registration information, and video of previous talks.
• Wikipedia: OpenStreetMap - Encyclopedia article about the open mapping project, with history, details of techniques, licensing information, and usage.
• MapQuest Dev Blog: MapQuest Opens Up – in the UK - Post detailing MaoQuest's experimental use of OSM data. (July 09, 2010)
• Ars Technica: OpenStreetMap: Crowd-Sourcing the World, a Street at a Time - Article by Nate Anderson explaining how wikipedia's 'crowdsourced knowledge' model have been applied to mapping. (June, 2010)