[Roadster] Additional gis data sources.

[Don Smith]

While I haven't looked to closely at these, I looked into gis data for  
a while, and other than conflicting formats I found the real secret was  
that there are massive amounts of free Govt. Data, though I didn't  
figure out how to get a free global yellowpages to actually give me  
business locations.

http://www.fhwa.dot.gov/binational/databank/gis.html
http://www.bts.gov/publications/ 
north_american_transportation_atlas_data/
http://www.geobase.ca/geobase/en/data/nrnc1.html