The Domain Ad Provider Script which automatically rotates between the two advertising providers is for sale. Available to Domainers for first time!

Assuming you already have both an Adsense and Yahoo Publishing Network (YPN) account you can automatically rotate between Google® ad units and Yahoo® ad units to determine which service tends to work best for your site. Ad provider rotation is also beneficial in diversifying your PPC income between the two major advertising networks. In addition, you can compare stats and look for the best performing ad provider for your sites.

This script may be purchased here
for only $20 (limited availabilty)