The business of Search covers a wide area: web search, mobile search, video search etc - you'll find that and all the techniques, and intricacies associated with it here.
There has been lots of chatter about an update in the last few days and Mozcast has been showing positive signs and now Barry believes there is definitely an large
We are all aware of the powerful Google Suggest tool that shows your query suggestions while you are typing. Suggestions are based on most popular search queries ("query-based")