Hi, n00b here. I run a web forum and have coded a similar revenue sharing with adsense to this place, but I've disabled it because it doesn't really work for me. I have adsense in the headers & footers, but I want to use Amazon for my users, one small unit for each post. I don't see any restrictions in Amazon's TOS with regards to how many can be placed on one page, I assume that's because they're PPA, not PPC, unless I missed it? So would adsense have any problems with displaying the Amazon units. They restrict to 3 units per page, but that is for their own ads.