Since I began testing AdSense versus Yahoo Publisher Network, many people have asked how they can test themselves by rotating the two on their own sites. Here are three ways you can do this.
SeRoundtable has step-by-step instructions on using phpAdsNew to rotate the two. phpAdsNew is what I use to rotate ads here in JenSense. While these instructions were not online when I added mine, chances are I probably did the identical steps when I set it up myself.
So if you have been accepted into YPN and are looking to rotate the two programs, using one of these options will allow you to do so and see for yourself which program monetizes best for your site.