Most Realtors have a website or two. Every one of them wants to know how it's doing. Well, certain search engines produce much better results for a site than others. Here are some recent graphs on how search engines have performed in recent months. Each search engine uses its own algorithm too so it's important to optimize accordingly...IMHO.
If you are looking for other website development tips, especially for the DIY site, check out this web design tips site.