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Something is up. We monitor google.de very closely and the SERP's have remained very static for a couple of weeks now. No jumping around of sites as we have seen over the past months with the exception of a few sites that should not be ranked as highly as they are. Last time I saw this there was a big shake up. Lets hope for the best results ; )
[edited by: tedster at 5:39 am (utc) on May 1, 2009]
Better check those pages, Google is usually pretty forgiving of a page temporarily returning a 404 or a 410. I'm surprised they removed them from the index unless they've been returning a 404 for a couple of months.