You may have heard the saying that "the gold is in your list" for your online business. I've found that to be the case, despite any number of social marketing techniques like bogging, My Space, etc. It's always extremely helpful to have a list of people to whom you can market.
How do you develop that list and keep adding people to it? You create a client-capturing device. A client-capturing device is a free giveaway that is of value to your target market and serves as a solution to a big problem that challenges your target market.
Once upon a time, the offer for a free ezine was sufficient to capture a visitor's contact info. Alas, that is no longer the case, so you have to up the ante and provide even greater value to your visitor. Your client capturing device can take any of several formats -- an e-book, a recording of a tele-class, a 6- part e-course, a short downloadable video.