Google just announced that it has launched CPC model for it’s Site targeting campaign. It even renamed their model from “Site Targeting” to “Placement Targeting”. This would be welcomed by many advertisers since most of them felt comfortable with CPC model as compared to CPM model. Advertisers will be given a choice whether to opt for CPC model or CPM model. More information can be found here:

http://adwords.blogspot.com/2007/11/two-updates-to-site-targeting.html