Easilly accessible special characters
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With English-US ANSI keyboard layout:

    1 keypress:
    ' , - . / ; = [ \ ] `

With English-UK ISO keyboard layout:

    1 keypress:
    like the US-ANSI one, but with # as well

With Swedish/Finnish ISO keyboard layout
(I think most mainland-European-language ISO-based layouts are
somewhat similar):

    1 keypress:
    ' + , - . <

With iPhone keyboard layout:

    2 keypresses (1 to switch to digits/specials):
    ! " & ' ( ) , - . / : ; ? @

Common accross all those layouts:

    ' , - .