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Dynamoo - 10:37 am on Feb 7, 2005 (gmt 0)
I'm not convinced that *old* sites are going into the sandbox. If you have an established site, then just forget about the sandbox. I think this is just a normal update gone wrong - there are a lot of sites just not indexed properly, and those are impacting on the results. I think the duplicate content filter is over-agressive too though, but basically these seems to be a too-early rollout of the SERPs based on incomplete data.
"National" Googles (.co.uk) etc seem to be pumping out very different results still.