Adsense beta?

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A couple months ago Google came up with somethng called adsense beta.

I didn't bother to learn anything about it, and the only relevance it has to
me is that since I started getting emails about it, my adsense earnings have
dropped by 1/3, while click rates etc. have remained steady.

Anybody know what this thing is and if it could be the source of my drop


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