Site targeting is a feature that allows advertisers to choose individual sites in the content network where they want their ads to appear. Currently, advertisers using site targeting place bids on a cost-per-thousand impressions (CPM) basis. In March, we plan to begin testing a new site targeting feature to increase the flexibility and control advertisers have with site-targeted campaigns: cost-per-click (CPC) bidding.CPC bidding has often been requested by advertisers who would like to utilize site targeting, but are not comfortable bidding on a CPM basis. Here are two examples of how CPC bidding can enhance your site targeting experience:Increased flexibility. Select the content network sites you want your ads to appear on and choose the bidding option that fits your needs. If clicks are your goal, try CPC bidding so you pay only when you get the result you want.Full control. Create new CPC site-targeted campaigns, or switch your existing campaigns between CPC and CPM at any time. As always, you retain full control over your budgets and bids.If you're an AdWords advertiser located in the US and are interested in participating in the CPC site targeting beta, please fill out this short web form: http://services.google.com/ads_inquiry/cpc_sitetargeting. Please note that we are only able to select a limited number of advertisers from all that apply. If you're selected as a beta participant, we will contact you within the next couple of weeks.To learn more about site targeting, click here.