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I too dropped 4-5 places on 2 of my danish sites around the 17th..  I have looked around on various forums and blogs regarding any google updates but nowhere does it seem to mention anything. But a lot of people seemed to notice similar drops around that day.

Would also love to know more about that update if anyone got any more information on it.

My thoughts exactly, never heard of any bad effects of having a sitemap if you don't mind your pages getting indexed. But glad to hear it wasn't just me who had missed a chapter in the big book of SEO.

Had a client today who contacted me regarding having no sitemap on his webshop (with about 2000 products). He told me that his design company, who had made his webshop, adviced him against putting up a site since it would be giving google to much information at once, hence making it stop visiting his webshop as much?

Well my first through was -okay this must be some kind of joke.
But with seo, there are always something, now and then, that still surprises you, So are there anyone else here, who could share some info on this?