The main differences from Chrome 1.0 (previous stable release):
30% faster
Autocomplete Forms
Increased stability
Full screen mode
Full page zoom (with pictures)
Deleting the “most visited” icons in a new tab
Suggest for third-party searches (such as Wikipedia)
Autoscroll (scrolling by pressing the wheel)
Acid3 99/100 and other delights from the updated webkit
And many other changes (including those imperceptible to the user - for example, a samopisny http stack).
The update will come automatically, or you can “customize” it through the “About Chrome” menu. You can download it on google.com/chrome . If you prefer the full "offline" installer, then it is available at this link .