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jomaxx - 6:03 pm on Sep 9, 2006 (gmt 0)
It requires a pretty low degree of interest in order to click a link, but the one thing that IS important is that people have to look at the ad and read it before they will click on it. So blending is a good thing up to the point that people need to interact with the ad block rather than mentally filtering it out. But I don't feel the need to go beyond that, to design anything obstructive or deceptive, and I think you're right that if this is what's driving your clicks then smart pricing will probably hit you anyways.
I don't think there's too much that can be said that's helpful from an AdSense publisher's prespective. It depends on the person and their current mood and goals, the website, and the ad itself.