Tech-Radar writes: "Install the Android 2.2 update on your device and you don't immediately see much difference, at least on the Nexus One, but there are some simple changes to the home screen.
There are shortcuts for the phone, app launcher and browser at the bottom of all the home screen panels and the main Home screen has a 'tips widget' for new users explaining what the launcher is, where the other panels are, how to add, move and delete shortcuts and widgets (and how to get rid of this very basic widget once you've mastered the Home screen)."