Via Kottke, the latest in Japanese innovation: machine-readable tombstones:

Behind doors on the tombstone that can be locked is a QR code -- a square code read by mobile phones that can link to Web addresses. Grave visitors can use the code to access images and photographs of the person while they were alive. [...] In addition to images of the deceased, people can view a greeting from the chief mourner at the funeral and browse through the guest book. They can also make entries using their cell phones.

Here are a couple photos: