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Google started the new Instant Preview Function with a spider who is taking a snapshot of the site.
This spider is using Java Script and also executes Omniture Code - this can be monitored within the browser report for Safari 3.1 which Google uses as user agent.
As other spiders and bots were generally filtered out I would expect that this new spider also should not be of any report.
Looks like there already is a comment on the Omniture blog about this: