Google is makes a serious play to attract Real Estate professionals, launching a dedicated page outlining their Google Tools for Real Estate Professionals.
Reading from their blog:
Here’s why it pays to use Google to connect to home buyers and sellers:
Google can help generate real estate referrals and leads.
* Google has more real estate searches than all real estate specific web sites.
* Google is the most-used search engine for researching and purchasing real estate information and services.
* The Google Network drives more traffic to ColdwellBanker.com and Century21.com than all other search engines combined – more than 70% of each site’s traffic.
* The Google Network reaches over 80% of U.S. Internet users.
Some of the products they are highlighting include Gmail, Calendar, Docs & Spreadsheets, Google Base, Maps, Adwords and their 3D modeling tool Sketchup.
This page is a similar attempt to start to pull together many separate elements and present them as a unified platform for small business owners. And it’s pretty clear. With all these services, Google is a becoming a very powerful destination for real estate professionals.



I would say done just look at google there are many other free places on the web to post listing. After all the more eyes that see your listing the better.
Yahoo also play a greater role in all of the searches as well as Craigslist, Trulia, and personal marketing. Driving the search to your site is important, but having the highest sale like RE/MAX agents is whats important to sellers.