Google Reputation and Trusted Core
Michael Martinez has a good post wherein he tries to explain the whole Google Trust and reputation thing:

Google can flag pages in its index as "Trusted", "General", "Penalized", or "Delisted (Do Not Show)". As many people have found, pages can "drop out of the index" but still be listed. That is, a page's URL will be returned for queries but no title or description are provided. These listings are regarded as "partially indexed" and often reflect pages that have not been recently fetched. Google knows about them through links. Activating SafeSearch in its most secure setting filters out uncrawled listings, but they are neither delisted nor penalized.



Previously speculation about this has been fragmented and scattered about many different forum threads and blog postings Michael Martinez tried to pull it all together into his take. Read the whole thing.

This sort of reminds me of the old Inktomi Best of the Web (BOW) index.
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