Google recently put an aging delay on ranking new domain names.  The reason for this is that many people were artificially inflating their ranking by using automated "link farms."  So now Google is suspicious of new domain names that suddenly have 1,000s of sites linking to them.

So a new site may rank well for a day or so, then disappear from the rankings for 6-8 months while Google makes sure the domain and links are legitimate.

Garland Coulson, "The E-Business Tutor"
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