Yea, I saw that too- and actually, I think it may increase clickthrough - so I'm all for it.
I wrote them back about the TARGET="_blank" issue. (Clicking on google Adsene Ads force people to exit your site. Unless they right click...)
Does anyone know an option to change that?
They wrote:
As AdSense is still a young program, new features are under consideration and your feedback is very helpful.
So if you got something to say let 'em know too!
Google AdSense [
[email protected]]
LT