Results appear for the top auto-suggestion as you type, with no need to hit enter or click the search button, while other suggestions appear in a drop down list. For example, I started typing Nice, France, and by the time I got through "nice f" a map of the city was already available, along a collection of photos and relevant links. Without typing anything else as I moved to Google's next guess, "nice france weather," I got a four-day forecast with high and low temperatures for the city.
Google claims that if all users switch over to the instant interface, it will amount to a savings of 11 hours of searching per second. The new feature is enabled by default for users in the U.S. and several European countries, but you'll need to be on Chrome, Firefox, Safari or Internet Explorer 8 for the service to work. Everybody else can still give it a spin following this link, or opt out by clicking the instant search link to the right of the search box.