A long press will bring up a menu with access to apps, contacts, and so forth. (pocket-lint.com)
The back button is on the right instead of on the left, and the left button brings up a menu for whatever app you're using. (tomsguide.com)
A little tab at the bottom brings up a menu of apps, including access to settings, the Web browser, email, and players for music, videos, and images. (computerworld.com)