Those three are my favorites. But if they aren't enough for you, here are some others worth your time.
At Lowe.org, you'll find a searchable library on such topics as leadership, strategy and customers. The site will often match you up with a book to buy, but many of the articles are free, like "How to measure customer satisfaction."
BizLand.com features many articles on marketing, including direct mail, marketing on a budget and promoting your site. Click on "marketing," then select "knowledge center."
WebSiteEstates.com is focused on building an online presence for your business. There are many useful articles, including "The only way to build a brand" and "Oops, my site sucks."
CCH Inc., makers of business software, has many articles geared toward beginners, taking you from "Do you have what it takes?" to "Choosing distribution methods."
ClickZ Today is a cornucopia of articles on every type of marketing tactic, with articles like "Ensure the success of your affiliate program" and "Media buying 101." There's so much depth here, you'll need to reserve some time to dig when you stop by this site.
Kimberly McCall is the president of McCallMedia & Marketing Inc., a marketing, public relations and business communications agency in Freeport, Maine. You may contact her at (207) 865-0055 or at www.marketingangel.com.