Here is a great article outlining Email Marketing for Realtors.

Here is an exerpt: 

"Forced to contend with softening home prices and the resulting struggle to attract buyers and close deals, many real estate agents are using web-based marketing tools to support their sales and marketing efforts. According to the survey, nearly 60 percent of respondents noted that their websites and the use of email marketing, produce the best results -- driving more buyers and sellers to their businesses. Among marketing methods, email marketing ranked highest in cost effectiveness and speed of delivery."

This is a great way to stay in touch with your clients, in a real-time fashion. Add to the yearly calender mail outs, and notepads by providing your clients with fresh content that keeps you in their minds. You can choose to write on Real Estate news, or even post photos of you latest vacation. Whatever it is - it keeps you in your clients mind. When you go beyond just your profession it adds that much more of a relationship. And it is the relationship with your email marketing list that brings in the dollars - any internet marketer will tell you that.

Here is the link to the rest of the post.