Google Instant is a major update to the default Google search experience, providing immediate, as-you-type search results that aim to speed up your everyday Google queries by two to five seconds per search.
You can see Google Instant in action in the video above, but here's Google's pitch for what's so great about Google Instant:
Faster Searches: By predicting your search and showing results before you finish typing, Google Instant can save 2-5 seconds per search.
Smarter Predictions: Even when you don't know exactly what you're looking for, predictions help guide your search. The top prediction is shown in grey text directly in the search box, so you can stop typing as soon as you see what you need.
Instant Results: Start typing and results appear right before your eyes. Until now, you had to type a full search term, hit return, and hope for the right results. Now results appear instantly as you type, helping you see where you're headed, every step of the way.
To accept Google's autocomplete suggestions while you're typing, you just hit Tab and keep narrowing down your query based on the live results. Google Instant is available for Chrome, Firefox, Safari and Internet Explorer 8, and it requires you to be signed into your account to use it.
You can read more about Google Instant here (including crazy statistics, like "If everyone uses Google Instant globally, we estimate this will save more than 3.5 billion seconds a day. That's 11 hours saved every second."). Right now, Australia isn't set to have access to the service for a couple of months, unfortunately. If it's already available for you, let's hear how you like it in the comments.
Google Instant [Google]