This is priceless: there is a site called Postsecret to which people mail postcards depicting their secret thoughts and obsessions.
The instructions [are] simple enough. 'You are invited to anonymously contribute a secret to a group art project. Your secret can be a regret, fear, betrayal, desire, confession or childhood humiliation. Be brief. Be legible. Be creative.'Story here. Site here. Sample over there to the right. [Hat tip here: The Goodness]