Map Wikipedia is a web mapping app that allows you to map an entire Wikipedia category. It uses the ArcGIS JS API, Node.js, Mongodb, and the Wikipedia API. It is still a work in progress, but I hope you will find it useful or fun.
Please post your comments and ideas for future releases here! I’ll add GeoJSON exporting and a few other things in the coming weeks. I hope to release the source code on Github after I clean it up a bit.