ASK HN: What alternatives to AdSense that work well with non-segmented traffic

My pet project Air Mail was doing well when all of a sudden the AdSense god of income decided I violate some of their T&C and stopped it all. After fixing the problem (Ad on a page with not enough content) I submitted it for review but it was rejected, this time without a detailed explanation.<p>I read through their T&C thoroughly and for the love of Gandhi I can’t find the cause for the problem.<p>Obviously my traffic is not very segmented; users come from all over the globe (170 countries) and use the service to register for 1000’s of different services of all sorts.<p>My question is, can you guys recommend an alternative to AdSense as an income source?