Community members have contributed some great information about baking naturally leavened breads. SourdoLady's pieces (who, as the name implies, knows a thing or two about sourdough) Wild Yeast Sourdough Starter  and her Deluxe Sourdough Bread  are among the most popular articles on the topic. JMonkey posted a great lesson on getting a sourer sourdough . Gaarp has also posted a wonderful sourdough tutorial . Other folks contributed some excellent recipes for sourdough pancakes  and sourdough banana bread .
When I had my first starter going, I was able to write a couple of introductory articles on sourdough: When Yeasts Attack: A First Experience with Naturally Leavened Bread  and More about Sourdough . These two articles contain enough information for an amateur baker to learn how to bake with a starter.
More recent forum posts, blog entries, and articles have included information on sourdough as well (and new information gets posted all of the time), so use the site search and look for terms like "sourdough" and "starter" to find the very latest.