Emacs: (for easy copy-paste into your .emacs)

  (global-unset-key [left])
  (global-unset-key [right])
  (global-unset-key [up])
  (global-unset-key [down])
  (global-unset-key [prior])
  (global-unset-key [next])
  (global-unset-key [home])
  (global-unset-key [end])