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I didn't find a great deal of examples, but I only got the old Google cache when searching for a site which wasn't in the Inktomi index.
Another strange thing was that for one of the site's I checked if I searched for 'thedomainname.com' it found the site (via Google), but returned no results for 'thedomainname'. For another site both types of searches found the site (again via Google as the sites aren't in Inktomi.)
I'm not sure why Yahoo would be hanging onto some Google results even on the Y!nktomi serps, or what the exact cirumstances are that returns Google results instead of Ink.