Adsense Insider Dan Friedman announced that Adsense is on beta testing the CPA (Cost Per Action) ads for Adsense.

Many of you already use referrals to direct users to your favorite Google products. Now, with our new referrals beta, you can select products and services from our base of AdWords advertisers. This is good news for those of you who have wanted to use referrals in the past, but couldn’t find a product to match your site’s content. With the referrals beta, you can search for products that match up directly with your site’s content. And you can customize your referral units to match the look and feel of your site, making it easier than ever to find a referral ad that fits in seamlessly with your site’s design and content.

It’s just actually the expansion of Google Adsense on its referrer program which publishers are paid through CPA. And based on Andy Beal’s pronouncement, it seems that Google is trying to compete almost all Advertising companies that exist online from selling text links (as of TextLinkAds), products in CPA (serveral affiliate companies like PC Security Shield), contectual ads (like Yahoo!).

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