With all these ad companys now I have been getting pretty confused with which ones I can use at the same time. Currently I use Chitika, Adbrite, and adsense. I would like to use yahoo but I cant do it without violating the rules.
Read on while I hash through this.

Google AdSense: “Google AdSense program policy does not permit Google ads to be published on the same web page as other contextually-targeted ads. To be more specific, we do not permit Google ads to be published on pages within the same domain as the ads of another contextually-targeted ad program.”

—–So basically if you use Google you cant use yahoo, Chitika or adbrite contextually on the domain. So you have to use Chitika targeted towards products and only use adbrite when you use direct ads and not network ads. You can also only use three Adsense ads per a page.

Yahoo: “While you may use Publisher Network ads on the same Web site as Google or Chitika ads, our guidelines do not allow you to install Publisher Network ads on the same pages of your Web site as other companies’ ads. However, we do not limit the number of ads you can place on a particular page.”

—–So you can use any ad on the same domain but it has to be on a different page. Unlike Adsense you can use as many yahoo ads as you want.

There are some ad revolving scripts out there but im not sure they are “allowed.” Especially since Google says no more contextualy ads and Yahoo says only Yahoo on a page.
1. Small code that does the job
2. phpAdsNew
3. phpAdsNew step by step Directions

You guys have any more information on this mess?

Update
* You are required to hide Chitika “Search” tab if you are running Google Adsense search in the same page. See # 2

Update
Rotating YPN and AdSense is a Bad Idea