hmm.. problematic. considering how people react on ads, it will be one more turnoff for the users. apart from that, i see rather a shortage of horizontal banner formats (and they'd be easier to implement on my sites). for text ads, the new format looks desperate. and concerning image ads..
Google wants more webmasters to embrace images and flash in general. I regularly get recommendations to turn images on but when I do it my earnings switch to cpm from cpc and I lose 50% of my earnings.
Do you think the 300x600, which is sure to be mostly images, will change that trend?
i think it's obvious that google adsense has a major problem with image ads. even when they as a tech company had the chance to gain an insight after buying doubleclick years ago, they didn't get the fundamental differences between text and image advertising.
image ads are not primarily suited for direct product sales - but in contrast to text ads, they are able to transport a visual impact. they provide an additional benefit for the advertiser. a benefit that isn't included in the accounting. so advertisers get a free ride, whereas the payout for the publisher simply is always too low.
in order to fix that, they would have to take image ads into a separate auction rather than let them compete with text ads which basically serve a different purpose.