"There are as many as 600,000 brownfields in the United States covering several million acres of land. While many people picture abandoned brick factories reeking of pollution when they hear the term, brownfields are actually considered to be any abandoned or underused industrial or commercial property... . New legislation that has eased certain liabilities concerning pollution and federal grants that can be leveraged for economic development, are turning brownfields into property goldmines for a growing number of communities. The combination of GIS and the Internet is helping all this happen."
Thanks to Chris Steins