Hey John,
The way to note your results is this. Think of the top 5 cities that you inspect in. Go to Google, Yahoo and MSN. Type in "city1 home inspector" , "city2 home inspector", etc. And see where your site currently ranks. Then you make note of your changes once a week and see how you're moving up/down.
Quite a few of the guys have had awesome results in a short time. For example, Google "Tennessee Inspector" or "Dayton Thermal Inspections". Some of the other guys can tell you how they've done. The beta testers have been using the system about 4 months, the system went public 2-3 weeks ago and some of those guys like
http://www.homeinspectoratlanta.com are ranking for all sorts of keywords. The other gauge is the number of jobs you're getting from your site compared to before as the attractiveness of the site encourages people to call.