SEOmoz has posted that Google has confirmed the existence to the sandbox. They may not call it a sandbox, but its real. No specifics as to what trips it have be provided, other than a mention that a filter must be tripped for a site to be sandboxed.
Now that the cat is out of the bag, a bit of information as to what one has to do to trip the filter would be nice, as well as information on why some sites are sandboxed longer than others.
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