Came across this in the AdSense FAQ and thought it might be useful to know Source: Prevent AdSense Ban
That's a great post. Everyone that posts an "I've been banned!" thread should be directed here, since it's not just clicking on ads that can get you banned.
Oops I posted my question in the the wrong thread Is using PHPAdsNew to invoke an iFrame to display Google Ads against TOS? I emailed them a while ago but got no reply. A lot of places use it so....I'm not sure
It will depend on how you use the IFRAME. If you jam the page with Adsense code full of high paying keywords and then have the AdSense ads showing the high paying ads displayed it would be a violation. If however you just use it to include the Adsense into your pages, I don't see a problem. Just make sure that you select the Frames option in AdSense. Also you might consider using a PHP include rather than an IFRAME. That way there will be no worries of violations.
Well, I'm definetly not jamming it. I'm just using it to rotate between adsense and chitika. i need to use the frames because the AJAX on vbulletin doesn't work when you try to display an ad in the last post.