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The domain name expired by mistake and the status of the domain changed.
Google stopped listing the site after the site was down for a few days.
The domain was renewed and new name servers assigned.
After 6 days downtime, the site was back and Google re-visited the site a matter of hours after the site was up again.
Less than 10 days later, the site has a much higher PageRank than before (one which makes more sense anyway), it comes up significanly higher in the SERPs for many very popular keyphrases.
What initially appeared to be a bad situation getting worse, it has actually worked out much better.
When the site was dropped, I emailed Google (3 weeks ago) and they have yet to respond.
Something to bear in mind.
Beaker