I usually use generic Head Lines such as Homes for sale in San Mateo County (or the city the listing is in). I also use Point2 (http://agent.point2.com), Zillow, Craig's List to propagate my listings again using the generic headlines. Also go into Realtor.com to enhance your listing with a detailed description. Good luck.
What you want is qualified traffic to your site not time wasters.
Take a look at http://www.postandsend.com its a website I created that has exploded with other agents using the same techniques like Proctor and others.
You need to be where the Buyers and Sellers are!
What you want is qualified traffic to visit your site. Trulia is a great place to list your property and so is realtor.com... However, as you know, every agent under the sun is there too...
Have you visited http://www.postandsend.com? I created this website for my own business and it has since exploded with other agents looking to find buyers and sellers using my techniques.
Follow the leaders like Proctor and others and dont try to reinvent the wheel. The formula is allredy there..