Today, Google announced the launch of Site Targeting, giving AdWords members the ability to target their ads towards specific sites. Site Targeting operates on the recently adopted CPM model. So, when Google or Yahoo (the two biggest PPC search ad suppliers) add or subtract something to their respective services, everyone in the industry looks up and takes notice. Such is the case with Google and the introduction of some enhancements to AdWords, specifically the ability to target users by site, or Site Targeting, as it’s being called.

Chris Richardson, (staff/search engine writer) at WebProNews writes that as the name implies, Site Targeting gives members the ability to just that: target their ads to specific sites by selecting the appropriate sites using the AdWords control panel. A feature such as Site Targeting gives vast amounts of control to the advertisers and their campaigns. By controlling which sites your ads appear on, targeting a campaign becomes much easier. According to Google, however, site-targeted ads will not by appearing in search results. These are reserved for ads targeting keywords. As the service name and option it provides disclose, site-targeted ads will only appear on the sites selected by the user.

Google’s Site Targeting service makes use of the recently introduced CPM (Cost per thousand impressions) advertising model. After users select the sites they are interested in targeting, they then have to select the maximum price they are willing to pay for every thousand impressions, or the ad’s max CPM. Unlike keyword campaigns, CPM means you’ll pay even if your ads aren’t clicked; of course, you’ll only pay once every thousand impressions. For more on Google’s approach to CPM, click here.