Here's a new book focused on GIS in Business. Looks interesting.
Geo-Business: GIS in the Digital Organization
Exploit the advantages of Geographic Information Systems in your business
Once the domain of cartographers and other specialists, Geographic Information Systems (GIS) are increasingly being employed by the business community. Location-based services, supply chain management, management of field-distributed equipment, geographical marketing and promotion, and the spatial web are some of the current business applications which make use of GIS principles.