I was writing a while ago about QR codes, what they are, how are they working, and what possible usages one can find for them. Today I read an article about the RosettaStone Tablet, and I think a QR code might also fit perfectly for this.
Long story short, the idea is to attach a QR code to a tombstone (this can be achieved for both existing or new stones) and allow the people that are passing by and that want to learn a few things about the owner of the stone, to read information about the owner, see photos, videos, or generally see the information that the owner decided to leave behind him/her.
To accomplish this, you need a server to store the information for each tombstone owner (this is exactly what RosettaStone is doing, but without the usage of the QR codes). The content stored by the server would be delivered upon request on the mobile devices of those that are passing by the stone and take the picture of the QR code.
It is a little macabre, I agree, but I think it is a nice effect and a good usage for the codes.