Kontera provide in-text PPC links, with double underlines so your visitors can differentiate them from normal links. When the visitor hovers over a Kontera link an ad is displayed and they can choose to click it or not. Following is what they look like.
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Adversal offer in-page pop-ups and pop-unders on a CPM basis. Following is what an Adversal ad looks like –
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CPX Interactive offer CPM ads, which means ads that earn based on impressions rather than clicks. Following is an example of one of their CPM ads.
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Text Link Ads lets you sell you text links on your sites. You install their PHP code and then they sell up to 10 links on your site, the price depending on PageRank and Alexa rank and possibly other things.
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