SirGraham - 12:08 pm on Dec 5, 2011 (gmt 0)

@ember: Switching from all text ads to mostly image/text ads.

I tested this a few times on my sites, basically the all text ads always performed much better than the image/text ads, no matter which size (720x90, 250x250, 336x280...).
But still Google keeps recommding image-ads

I normally put the big formats 328x280 above/inside the content. Link Units on top of the navigation.

And i use advertisers who pay per view on ads which are normally placed a bit outside the content (skyscrapers, leaderboard on the top) and do not perform so well with google adsense. Pay per view is hard to find but its still possible.