There's nothing I love more than public signs (I've photographed over 2500 of them!); they reveal the things that people think other people don't understand.
Portland, Oregon has some of the world's greatest signs and notes, a combination of naked aggression, passive-aggression, dreamy hippieness, and WTF.
The Portland Noted tumblr rounds up all these and more, in a steady stream from the city where the dream of the nineties is being crushed by the global finance/property speculation bubble.
(Thanks, Fipi Lele!)