The method I use when I am seeing which of my competition as Realtors has the best presence I go to the major search engines and search for terms that are appropriate for my specific market area. How do I rank compared to them. Then I know what I need to strive for or how far ahead of my competition I am. I do this on Google, Yahoo and MSN. It is always interesting because often one may have a high ranking on one, but not another. I also go to http://www.marketleap.com/default.htm
which allows myself to easily find out how my site ranks against anyone elses. The search engine saturation choice is the best to find the rankings.
I also search the Realtors name to see how many pages come up for each. I can search one agents name and see three items come up, and with another there can be thousands of pages. I think this is important as many agents think they have a website, but instead actually have a web page. Many companies and MLSs give agents a web page.