gmb21 - 2:14 pm on Mar 30, 2012 (gmt 0)
Notify your site visitors of the third-party vendors and ad networks serving ads on your site.
Provide links to the appropriate vendor and ad network websites.
Inform your users that they may visit those websites to opt out of cookies (if the vendor or ad network offers this capability). Users can opt out of some, but not all, of these cookies in one location at the Network Advertising Initiative opt-out website
Other ad networks only accounted for about 1% of my income anyway, but my EPC is too variable for me to be able to tell if it made a difference to that or not.