Adsense + Kontera: Bring extra income:

Few months ago, Kontera was being served to the websites getting more than 5,00,000 hits per month.But, because they have now lowered the bar, and are allowing everyone to join, it is great opportunity for many publishers to earn extra.(Read more ....)

This combination works best for the websites getting moderate traffic.The Kontera ads do not violate the adsense TOS because they are totally different from the adsense ads.The adsense ads will surely bring more income but the Kontera ads will bring extra revenue.The Kontera ads return good results in terms of CTR but the CPC (Cost Per Click) is low.Some webmasters do get good CPC with Kontera but they are few in number.Generally, going through the earnings of the webmasters, it is found that out of the total earnings,
Income through Adsense--88-92%
Income through Kontera--8-12%

(The Kontera ads are in-text ads and hence they do not affect the design of your website.You can try the different coloured ads offered by them.The colour should be chosen such that it will not affect the overall look of your content.)