Inspired by the article at Techcrunch here are some more tips:

• Four fingers drag up (iPad) - brings up the app switcher.

• Five finger pinch (iPad) - shows the home screen.

• Go to Settings, select General, then select Accessibility; turn Assistive Touch on, and it will add a floating home button to your screen.

  

• In the keyboard, touch and hold a key to bring up special characters associated with that key

• Moving icons around and want to exit the squiggly icons mode without using the home button? Pull down the notification center.