PaperKarma works on magazines, catalogs, coupons, fliers, credit card offers, and even the Yellow Pages. To sign up for the service, you need to hand over a bit of your own information, including your address and email. Once you do, all you need to do is snap a picture of the junk mail in your mailbox and PaperKarma unsubscribes you from the list. The nice thing is that you can pick and choose what you unsubscribe from. If you like getting a particular catalog, you can keep it on your list.
It's currently a free download for iPhone , Android , and Windows Phone 7 .
PaperKarma | via TechCrunch