So the mystery is cleared, if your site falls drastically, it is NOT always your fault – perfectly good sites with high TrustRanks can take a drastic dip....

Take for example the Google Webmaster Guidelines – for a couple of years it was in the top 20 – then the past couple of months it made the Top 10 Serps for "Search Engine Optimization"

in about 1/2 of the datacenters it suddenly dropped 200 places.......

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http://www.mcdar.net/q-check/datatool.asp?yoursite=http://www.google.com/support/webmasters/&keyword=search engine optimization&bank=.400&Pages=

http://kzay.com/q.php?dc=104&q=search+engine+optimization&num=100

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http://www.google.com/search?q=search+engine+optimization

Drastic Change in Search Engine Optimization SERPS

Google Update for June

I still see the usual suspects... like submitexpress.com or seochat.com...

http://kzay.com/

Do a careful analysis with this tool – you can see the changes in MANY MANY keywords – and also significant drops for many sites enjoying long runs at their current positions