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incrediBILL - 12:15 am on May 1, 2010 (gmt 0)
I segregate 'cache and other views' into a separate Analytics report, and see it runs from under 1% to less than 5% (usually 1% or less depending on the site).
To appear in GA implies javascript running.
Scrapers scraping cache tend not to enable javascript to hide their activities.
I catch them loading images via google's servers.