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Generally Google is a really messed up company because they cannot maintain serps consistency and constantly changing things. It's like if you do a search for something with Canada Google, you get results and if you do the same search on the US Google, you get similar but there are differences, likewise if you choose yet a different google locale, its different. PR's are even up and down with sites and getting worse with a bouncing yo-yo effect and with site positioning.
Google won't disclose anything so its nothing more than a guessing game to anticipate what they are doing. However, there are major changes coming over the next year with search engines and its going to have a lot of negative results (perhaps some good ones) for most.
I think we will see a lot of the big guys slowly disappear...the problem will be maintaining seo. Its becoming a full time job effort on top of your site management. I see this taking the majority of time out of your daily routine.
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