One of the new features of OS X Lion (10.7) is Full Screen Apps. This has always been a feature of the web browser Google Chrome, but now with the inclusion of the “full screen” button, the ability to exit full-screen mode doesn’t work by just hitting the escape key – as it does with other OS X Full Screen Apps (Safari, Mail, iPhoto etc).
Below you’ll see an image of the new “full screen” button included in Google Chrome.
If you use this button to make Google Chrome go into Full Screen Mode, hit the keyboard combination command + shift + f to exit Full Screen Mode.
At some point I suspect the folks at Google will add the “escape key” feature to exit Full Screen, but for the time being – the above keyboard shortcut will do the trick.