Matt Cutts said this is Google make an effort to "level the enjoying field" between website owners that construction material compared to website owners who are just really competitive SEOs.
I just observed this by enjoying the sound documenting from the board he was on at SXSW per several weeks time or so ago.
He said, and I quote:
What about the individuals improving really hard and doing a lot of SEO. We don't normally pre-announce changes but there is something we will work in the last few a few several weeks and want to launch it in the next a few several weeks or few several weeks. We are trying to stage the stage a bit. All those individuals doing, for deficiency of a better term, over marketing or far too SEO - compared to those making excellent material and excellent website. We are trying to create GoogleBot wiser, create our importance better, and we are also looking for those who misuse it, like too many look for phrases on a web page, or return way too many hyperlinks or go well beyond what you normally anticipate. We have several technicians on my group operating on this right now.
I am surprised I didn't listen to this previously but I think individuals skipped it?
We did see a lot of problems of position changes this several weeks time. But Google declined any up-dates of any type. I question this is proportional or maybe Google is examining it?
Brace yourself SEOs - here comes something big! ajmlseotips.blogspot.com