Just search amazon in Google to search "google" in Amazon to...

This is a could new feature, a good way to teach people to use "site:" and the best mean to keep searchers in Google search!

From: searchengineland.com/080304-16 ...

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.*
googleblog.blogspot.com/2006/0 ...

Perhaps, but who don't get it?
As Google say: "There's no set schedule when we'll roll out these sorts of new ideas" so there can be a schedule, finally...