I just saw this over at SEland. They had reported on it back on December 19th last year.
Matt Cutts commented on it at SELand back then with this....
Quote:
Reader Comments
I commented over on your post, Barry, but yup: this is new. As always, we experiment with ways to help users, including query refinement. Any new feature has a high bar to meet before we turn it on 100%; we don't want features that crowd the page but don't really help users.
Comment by Matt Cutts | December 19, 2006 1:40 PM
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And so Matt. I'd like to see it a bit more and then see if I think it helps me
