Here's an interesting quote from GoogleGuy at webmasterworld.com:
Quote:
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Hey, the index is going to be coming out real soon, so I wanted to give people some idea of what to expect for this index. Of course it's bigger and deeper (yay!), but we've also put more of a focus on algorithmic improvements for spam issues. One resulting improvement with this index is better handling of expired domains--the authority for a domain will be reset when a domain expires, even though dangling links to the expired domain are still out on the web. We'll be rolling this change in over the next few months starting with this index.
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http://www.webmasterworld.com/forum3/10036.htm