Google Update Big Daddy
In early 2006, Google upgraded their crawl and indexing systems to a new architecture that leveraged different crawl priorities.
This update has caused many sites to be not indexed, partially indexed, or stuck in the supplemental results. Matt Cutts mentioned on his blog that many sites that were well-indexed are no longer indexed or reduced to only having a few pages indexed due to having primarily low-trust, spammy, inbound links, shady outbound links, or participating in cheesy link exchange networks.
The message worth emphasizing again and again is that Google is looking for quality editorial links.
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