Competitive Intelligence (also called Business Intelligence) is information obtained ethically and legally that is used to gain an advantage in commerce. A broader definition of competitive intelligence is the action of defining, gathering, analyzing, and distributing information about products, customers, competitors and any aspect of the business environment needed to support executives and managers in making strategic decisions for an organization.
Books
Competitive Intelligence Advantage: how to minimize risk, avoid surprises, and grow your business in a changing world. Seena Sharp. 2009. (658.472 SHA)
Analysis Without Paralysis: 10 tools to make better strategic decisions. Babette E. Bensoussan. 2009. (658.401 BEN)
A Cautionary Tale
The Big Lie : spying, scandal, and ethical collapse at Hewlett-Packard Anthony Bianco. 2010. (338.7 BIA)
Websites
Online resources are a great way to keep up with industry trends and events.
Business Source Complete
Yahoo! Finance
ReferenceUSA