This is Jonathan from Kontera. I'd be happy to share a little bit about our company. With 15,000 publishers and over 140 million unique users per month, Kontera is the leading in-content provider, supplying double underlined in-text ads, that appear after you scroll over the highlighted phrase with your mouse.
Because Kontera is displayed in a completely different part of a webpage from AdSense, In-content vs. banners and text ads to the side, Kontera is completely compatible with AdSense, in fact most of our Publishers use both to optimize their earnings.
Kontera Community Manager