Let's say that you own an online craft store. You might write a newsletter on the following:
-Fun Craft Ideas for Stay At Home Moms for $5 or less
-Holiday Gift Giving Ideas
-Tips on Using In-Season Fruits and Veggies in Your Seasonal Decorating
-Exciting Craft Projects to Entertain Your Kids
Can you see what I'm talking about? The possibilities are as limitless as the opportunities for you to keep in touch with your customers. Don't shy away because you are not the best writer! Anyone can produce an interesting article if it is geared to something the person is passionate about.
Check out my own product for writing and publishing an income producing newsletter:
http://www.createandpublishanewsletter.com/
A wonderful resource to learn about writing effectively online is a website called http://www.write101.com.
A newsletter is a WONDERFUL tool to add value to your website, keeping your readers happy and looking for more!
Another benefit is that you are keeping yourself in front of your list (remember your list?) with more than just electronic communication. While a newsletter can be delivered via email, it is even better to deliver it on good old fashioned paper via the mail. This way your list sees you even more.
(Note: this article is part of a mini-course with twenty lessons. You can find that entire free mini-course here: http://brentriggsblog.com/minicourses.asp )