How cool is this?? You register at postcrossing and then request an address. They email you an address from another registered user along with a postcard id. You send this person a postcard, including the postcard id. When they receive it, they log its receipt, and then you're eligible to receive a postcard. It's like chainmail but funner :-)
(Thanks to schwan272 via the carving consortium for the original link!)
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