What is that little switch with the squares called?

Yes, it is called the Menu Key

I located some wonderful details on the phone is buttons from AT&T is website also: Motorola Flipside Tutorial

Closed View

1. Earpiece : Lets you listen to the customer and also automated motivates.
2. Power/Sleep : End a call/ Turn off the tool/ Sleep setting.
3. Micro USB : Charge the phone or connect to a COMPUTER.
4. Food selection : Press to accessibility below - food selections with added alternatives for various attributes and also applications.
5. Residence : Press to go back to the Home screen.
6. Microphone : Captures sound.
7. Trackpad : Use to select tiny things in the display screen, or regulate a video game without obstructing your sight. Simply flick throughout the pad to scroll or relocate, and also push the pad to select.
8. Back : Press to go back to the previous screen.
9. Look : Press for message search ; press and also hold for voice search.
10. Electronic camera : Use to take images and also fire video clips.
11. Quantity : Use to readjust the quantity.
12. 3.5 mm Headset : Allows you to connect in a headset with a 3.5 mm adapter.

Open View

• 13. Change : Capitalizes letters throughout message access.
• 14. Alternative : Inserts alternative personalities.
• 15. Food selection : Press to accessibility below - food selections with added alternatives for various attributes and also applications.
• 16. Back : Press to go back to previous screen.
• 17. Look : Press for message search ; press and also hold for voice search.
• 18. Room : Enters a room right into message.
• 19. Icons : Opens a table of icons.
• 20. Scroll/Select : Use to browse up/down and also right/left on the screen.
• 21. New Line : Start a new line ; sends out message when message messaging. Additionally called the Enter key.
• 22. Delete : Press to delete message.