Google have started to add personalization on the left-hand side with SearchWiki. I think a problem with it is the effect is not obvious - sure the ranking might be different for you if you do the same search again, but how will it effect different searches? By doing much more obvious personalization which is applicable for every search you do thereafter, I think WebMynd gives more value for the (small) effort to configure it.

Also, whatever they might like to experiment with, I think Google will be reluctant to try radically different designs or really mess with the right-hand side of the page. As a public company they need to optimize for ad-revenue.