Showing up on the tech news today...

http://www.propublica.org/nerds/item...apping-library

a C based API for getting public vector data rendered out using a cloud based parallel server to provide rendered tiles of a regional area - presumably to load into google maps type thing. Prob use this in my app as well. Sounds good for people wanting real world maps with custom features. From my quick read it looks free but I am not sure.