Google Suggest Added to Google main search

Google made it official that they have added Google Suggest (Auto Complete ) into the main search in Google.com.



Let me put some ideas on how Google is making this possible and where is the data coming from .Google gathers information of search data from lot of their online tools and generates consolidated results like what people are searching,whats the trend , most frequently searched keywords. Some Google tools which gives these data are :

Google search (Of course)
Google toolbar
Google web history