Google Gravity Affect: Google Gravity shows Gravitational force affecting Google’s Home Page. Simply visit the URL and watch Google falling from top to bottom then getting shattered in to small pieces.
You Can Do A Barrel Roll: Typing ‘Do a barrel roll’ in Google Search Box Rotates it on its own axis
Google MentalPlex: Search simply by thinking without typing anything in search box. Follow this URL http://www.google.com/mentalplex/
Google Turned into a Playable Guitar: You can play Guitar in Google using your mouse and keyboard. Follow this URL http://www.google.com/logos/2011/lespaul.html and start playing.
You Can Play Popular Pacman Game: Visit to http://www.google.com/pacman/ and start playing version of this famous game.
You Can Tilt Google Search Results Page Simply type Tilt and see what happens.