The new Google Suggest feature

Google Labs have just released the beta version of a new Google tool: Google Suggest. As you type into the search box, Google Suggest guesses what you're typing and offers suggestions in real time.

How does it work?
"Our algorithms use a wide range of information to predict the queries users are most likely to want to see. For example, Google Suggest uses data about the overall popularity of various searches to help rank the refinements it offers."
Google Suggest is based on a JavaScript library. When you type a letter, Google Suggest requests a special modified version of Google's search tool which only returns the necessary data.
Google Suggest disables your web browsers auto-complete feature and it defines a field for the new auto-complete popup menu. Each time you enter a character in the search field, Google Suggest fills that field with the results of a query to a special database.