When did Google start displaying "Did you mean" results?

[postlink]http://mattcuttsvideos.blogspot.com/2009/03/when-did-google-start-displaying-did.html[/postlink]http://www.youtube.com/watch?v=9GCZ-jtPlMUendofvid
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On February 26, 2009, Google software engineer Matt Cutts collected questions on Google Moderator and answered many of them on video.

BlindFiveYearOld from SF, CA asked:

When did "Did you mean" search results begin to be displayed? And what is the criteria for presenting "Did you mean" search results above the normal search results?

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