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Lately what I tend to do is leave Adsense ads off the site for a couple of months. This will give me time to go out looking for links. I often believe people are more likely to link to you if they see you as non commercial. Sometimes ads can make you appear commercial.
Also, to keep ads from displaying if you are doing a lot of site work in the future see [webmasterworld.com...]
If you need to see how the ads look take a shot of the AdSense ads and save them as image files for site testing.
That's what I always do..
Great solution while you're working on your site,
then you don't need to think about low ctr / ecpm and so on..
It's also a simple way to check which pages will make the visitors ad blind.
As has already been mentioned, many publishers use image 'placeholders' for AdSense ads when building their sites. To do this, you can find the size of your preferred ad format at: