This may be interesting: My guess is if you set a CPA target similar to what you are getting from Google Adwords, your going to get less volume. There may also be an issue of Affiliate Fraud to be cognizant of; from my experience with other affiliate networks. JL.
As part of Google’s integration of DoubleClick, the DoubleClick Performics Affiliate network is now part of Google. To consolidate our offerings, we will be phasing out the AdWords pay-per-action beta in the last week of August 2008. The Google Affiliate Network, previously known as DoubleClick Performics Affiliate, has been in operation since 1998. Through the network, advertisers can open their ads to all publishers in the network, or select specific publishers that match their criteria. You can set a CPA for your entire campaign or establish custom payment schedules for specific publishers — such as a higher CPA for a particularly optimal placement. The Google Affiliate Network is currently a separate product from AdWords and AdSense. As with AdSense, publishers must apply and be accepted into the network.If you’re interested in learning more about the Google Affiliate Network, please visit our website.Posted by Trevor Claiborne, Inside AdWords crew