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tedster - 3:09 pm on Mar 10, 2008 (gmt 0)
I assume that this may be a new version of what I've called the "honeymoon period" for new sites. That is, if the user data that Google collects for a new site in the SERPs doesn't show that Google searchers like it, it still may vanish just as fast as it showed up. Time will tell.
I see something similar, with relatively new domains making a sudden apppearance in many SERPs this past week. If they can keep the spam limited, this would be a good thing.