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The affiliate images are on the affiliates domain, not mine so I don't know what I can do to stop this.
X-Robots-Tag: noindex HTTP Response header returned with those image requests.
I think pharanque and rainborick have missed that the thumbs are hotlinked from the affiliate domain.
"It just doesn't make sense"... you got that right! This smells like a Google bug to me..
But it also shouldn't be indexed as belonging to your site. It just doesn't make sense.
[edited by: indyank at 5:38 am (utc) on Aug 24, 2012]