What other government agencies/datasets provide API's that take FIPS and return data?
The latitude/longitude conversion API seems pretty cool. I was hunting around online, and had a hard time finding anything that would consume the FIPS code. The API description says "Providing this search allows developers to build applications which foster connectivity from their individual location to the full array of federal databases based on census geography." Perhaps a link to (even an incomplete) list of data sources which consume this would be very helpful.