Since I started the Affiliate Marketing Ecourse, I was able to understand the importance of article submission directories when you are promoting or selling products and services. This will not only create a big exposure to your website but to the product you are promoting.
There's a lot of great article directories you can find over the internet. But for someone who's just learning how to make money through online promotion or selling, it is practical to start with free content. As you learned and started promoting products or services, you can decide for yourself if it is worth to spend money for an article submission directories or not. Howto.fm provides free content for your website and howto toturials and information about many topics.