Signs are an Incredibly Cost-Effective Form of Advertising
Seth Godin - Best selling author of several marketing books. Called "the Ultimate Entrepreneur for the Information Age" by Business Week. Check out his blog
here.
Guerrilla Marketing - One of the best marketing resources for small-business success in the 21st century.
About.com: Marketing - several articles on different aspects of marketng your business.
Marketing Books
"
Why We Buy: The Science of Shopping" By Paco Underhill: Underhill analyzes shoppers' behavior in stores and offers simple suggestions for retailers to improve their sales.
Books by Seth Godin - "From All Marketers Are Liars" to "Meatball Sundae" Godin's books not only offer great ideas about marketing but are great fun to read.
Internet Marketing Resources
Constant Contact - One of the most affordable email marketing services available.
SiteReference - Internet marketing and SEO (Search Engine Optimization) Articles.
SEOChat - Search engine optimization, Google optimization articles.
WebProNews - eBusiness news and internet marketing articles.