Links that may be of interest:

email me when you find more! (bgraves@email.uncc.edu)

http://www.infoshop.org/myep.html
(The Mission Yuppie Eradication Project: an example of gentrification backlash)

http://www.bts.gov/btsprod/nts/chp2/tbl2x13.html
(Data on the historical cost of gasoline in the US from the Department of Transportation.)

http://ntgis_netvs.co.mecklenburg.nc.us/taxgis/disclaimer.htm
(if you have any interest in buying property in Mecklenburg County this site is worth checking out)

http://www.ospl.state.nc.us/demog/
(the latest demographic data for North Carolina and its counties)

http://www.census.gov/ipc/www/idbpyr.html
(population pyramids for every country in the world, very cool)

http://plue.sedac.ciesin.org/plue/ddviewer/
(demographic data viewer for your browser, a very cool way to look at the 1990 census data at the state, county or census tract level)

http://www.census.gov
(this is a VERY deep site that includes demographic and business information, spend some time looking around here)

http://www.terraserver.microsoft.com
(Satellite photos of  most of the US use this to gather land use information)

http://www.mapblast.com/mblast/index.mb
(better maps than Yahoo, they include RR tracks)

http://www.internet.org
(click on Location and then the Index of Internet Cities for a measure of Internet connectivity)

http://www.bts.gov
(The US Bureau of Transportation Statistics, an unlimited supply of inter and intra-urban transportation statistics. A good companion to the census site)

http://edcdgs9.cr.usgs.gov/urban/
(This is some REALLY COOL research and mapping on urban area expansion over time in the US. A great place to learn more about urban areas)