SBA - Marketing
Advertising and marketing information and resources provided by the Small Business Association, including marketing basics, ideas, plans, and FAQs.

FTC - Frequently Asked Advertising Questions: A Guide for Small Business
Detailed description of laws and regulations governing how small businesses may advertise, provided by the Federal Trade Commission.

CCH Business Owner's Toolkit: Small Business Guide
Includes a detailed guide to Marketing including research help and guide to building a successful marketing plan, as well as a section on Internet Marketing for Your Business.

SCORE
SCORE is a nonprofit association that boasts both working and retired executives and business owners who donate time and expertise as business counselors. Several useful articles written by SCORE members can be found using this site.

Entrepreneur Magazine
Contains links to marketing articles from the popular magazine, including how-to guides, marketing basics, marketing ideas, and online marketing.