A quick article worth reading on the Google +1 button that can be added to your website a bit like the Facebook ‘like’ button but read this article it also contains details on how to add it
Google will be personalising search engine results which basically means if you use amazon a lot then amazon pages will get a boost within your search results. From what u have read you will get this automatically and have to actually opt out.
This does explain some of my recent results but as far as i can see does not bode well for the likes of myself who like to check organic listing positions for set keyword combinations as part of ongoing SEO work. even if I opt put how can I guarantee that the results are true? Please read more and I willprd than likely blog more in the future on this.