You cant hide from big brother and yes if Google is big brother , then big brother is all around you.
So what does google know about you?
To get a sample if you use a lot of different Google services , you can just login with your id here
And you will see everything that is connected with your login is now integrated and connected with each other. If you login to browse Google search with your smartphone it even tell you what smartphone you are using
Name: samsung GT-I9000 Vodafone
Last activity seen on: 24 Feb 2012
It even logs your webs browsing history and many more things done on google. go check itout