On a recent teleclinic with Chris Knight of EzineArticle.com we talked about reaching critical mass. Critical mass is that number of articles posted when the traffic begins to flow your way.
Article writing and marketing is one of the most powerful ways to build your business. This applies to your area of expertise, whatever business you are in.
The written word is incredibly powerful. Writing articles sets you apart from your competition. You never have to say "Listen to me, I'm an expert!" Your articles do that for you, because articles increase your "expert-ability."