One of the best marketing tools I use is the "Rent vs Buy" piece, which shows buyers the benefits of buying, and the cost savings over the course of time. My lender provided me with the information, and I customized the piece with my contact information. I also do the same thing for Open Houses, where I have my lender break down the various loan plans, and the monthly payments for each, so buyers really have a strong understanding of how much it will cost.
I have worked with a lot of people who simply don't know how to get started in buying a home. These marketing pieces really help!