Google has introduced a new beta program for their AdWords customers. Pay-per-action ads are part of a new pricing model that allows advertisers to pay only when specific actions that they define are completed by a user on their site. Rather than paying for clicks or impressions, advertisers can choose to pay when a user makes a purchase, signs up for a newsletter, or completes any other clearly defined action that they choose. Pay-per-action ads are eligible to appear on publisher sites in the Google content network, either in publisher-selected ad units or in standard AdSense for content ad units.