Diacritics in the OSX British/US keyboard (for Portuguese users or any other users of languages with diacritics)http://en.wikipedia.org/wiki/Diacritic

diacriticsmap

Mac OSX keyboard layout switching is a pain.
Using a keyboard layout different than the one actually printed on
your keys is also weird. The following keyboard shortcuts allow you
to create the various diacritics used in languages like Portuguese
on the British/US layout of a Mac keyboard.
 
 
Alt+e -> ´ Examples: é ó á
Alt+i -> ^ Examples: â ê
Alt+c -> ç
Alt+` -> ` Examples: à
Alt+n -> ~ Examples: ã õ ñ
Alt+0 -> º Examples: 1º
Alt+9 -> ª Examples: 1ª