Basically, I can purchase a basic data tag for around $225 from Objecs, where I can then embed up to 1,000 words of prose about myself in the third person for when I am gone. Then, when the tag is installed on my tombstone, any RFID-enabled phone (think future iPhones) can scan the tag and read the embedded information. Right now, I could have a memorial story and a photo, but who knows what the future could hold (movies? books?). The tag's internal microchip will use the RFID phone's own magnetic field to power up just long enough to let the phone read the data, so in theory, the company claims that the tags should last at least 3,200 years.
Honey, add this to the post-mortem checklist!