I just revisited mine this week so I thought I would mention it..
Memory Medallions are small coin-like medallions that have a variety of uses but the most common is placing one on a headstone, which is what I did. Mine was given to me as a gift after my parents died -- my mom in 2010 and my dad in 2011.
Here you can see the medallion in the lower right hand corner.
The medallion has a QR code on it:
The code can be scanned with any smart phone.
When you scan it, it takes you to a web page. The web page is yours to complete however you wish with stories, photos, videos and links. (I need to link to this blog!)
This is mine:
You can also take a picture of the bar code to use later -- or you can go to the Memory Medallion website and search for the page by the name.
They are kind of pricey and of course there is always a million comments and questions about being able to use them with future technology and people using them for identity theft etc. but the concept remains pretty awesome. I don't have much on my parents site. No video and only the one picture. I can't help but wonder if putting one on my great-great grandparents headstone, might connect me to distant cousins! I know technology has already connected me with many cousins I would never have otherwise met.
Another thought - you could purchase one for your own headstone and leave whatever messages you want!