Google To Roll Out Ads on Demand?

Some time ago I wrote about Google testing a new Adsense feature that allows users to view ads on the topic that interests them and not necessarily relevant to the host page's content. Today on one of the pages on this site, I spotted a search box instead of the usual Google links. It might have been a glitch, since the "go" button, when clicked, led to an empty page (at a Google Adsense address, though).
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