There's a new case study in the adsense blog. By blending ads in, and making them more visible, they increased their revenue substantially.
Now that's great, but when I checked out the site, I think it's really deceptive.

The title is a question, and right below this question is a 336x280 ad block.

I bet many people clicking on it may be thinking that by clicking on it they will get the answer to the question.

For example, one question is, "How to apply eyeliner?"

Right below that is an ad with the title, "Applying eye makeup", followed by "How to apply eyeliner"

wellcome to www.0058.net

I've run into more than one site in which the ads were presented as navigation or part of the site structure.

By making the ads the same color as the background, and not having a separator in between, they are not clearly labeled, and I will bet you anything if studies were done with regular web users, most would not know they were clicking on ads.