How to rebind the backspace button to the "Back" command in Safari 6
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1.) Set an arbitrary shortcut for the command in the System Preferences
2.) Go to ~/Library/Preferences and open the com.apple.Safari.plist file
3.) Find the NSUserKeyEquivalents key.
4.) Replace the shortcut you had previously set by this one: "⌫"
5.) Profit!

Any questions: @jrigerl