Great idea, perfect name. PaperKarma aims to decrease the 44% of unsolicited US mail piles ending up in a landfill. Users simply snap a photo of each piece of junk mail they never want to see again, and the PaperKarma team works with source companies to unsubscribe them. You can also choose to receive the corresponding email version, if you still like the company but want to save some trees.
(Image of Transit Mailbox)