Business.gov

Provides extensive information on marketing a business, including advice on international sales, customer service, competitive analysis, marketing plans, eMarketing, and much more.

Entrepreneur.com

Tips for sales and business marketing.

Advertising Age

Online version of the weekly magazine that provides comprehensive news on all aspects of the U.S. advertising business.

Web Marketing Information Center

Links to thousands of articles about effectively marketing your business on the Web.

FedStats

Statistics from more than 100 government agencies. Useful when conducting market research.

Just Sell

Resource for sales and marketing, including guides for networking and customer service.

KnowThis.com

A virtual library for advertising and marketing resources.

AdsGuide

A directory of Internet marketing and advertising services.