Hi!
Unfortunately, the default keyboard layout of Emacs binds CMD to "Super" and ALT to "Meta". While this work when using an American keyboard, it is not good for us european users.
Fortunately, it's relative easy to configure this yourself.
One common layout is to bind CMD to "Meta" and ALT to "compose":
(setq ns-command-modifier 'meta)
(setq ns-alternate-modifier nil)
Another layout is to keep the left ALT key as Meta and bind the right ALT to "compose":
(setq ns-right-alternate-modifier nil)
-- Anders Lindgren