An Idea that's Dead on the Money! Pun Intended :)
I don't really consider myself an internet marketer, so, no use for me, however, I can see this as being BIG ~ as in a million dollar business for you online guys.
It's applying QR codes to grave headstones and linking it to a mobile/online memorial.
Here's a link to a random website I found online:
Preserve your loved ones memories with our QR Memorials
Not my cup of tea, for sure, but, for you tech guys, I'd be on this one like white on rice
http://www.amplegreenfoundation.com
Where Green Ideas Grow