This week the White House announced the Opportunity Project. It is an open data initiative geared towards empowering communities with data and tools to improve economic mobility. Open data is the data equivalent of open source software. It is licensed so that it is freely available to use by anyone.
The main page for the project can be found here: http://opportunity.census.gov/.
It includes links to sources of open data and online tools built on open data, ,many of them map based. This looks to be a great resource for Community Health Mappers!