Training

Using GIS as an Economic Development Tool
The Ohio State University—Department of Agricultural, Environmental, and Development Economics:

Economic Development Technology
Tennessee Institute for Economic Development

GIS in Economic Development Using ArcView course
Digital Quest, Inc.

GIS in Economic Development and Real Estate course
Edgetech America, Inc.

What Is GIS?
An extensive introduction to GIS written by ESRI from the GIS.com portal

ESRI Virtual Campus Online Library
More than 500 references on the use of GIS for economic development (keywords "Economic Development")