Check out this story (Friday, August 06, 2010) By Erich Schwartzel, Pittsburgh Post-Gazette

Photo – Rebecca Droke/Post-Gazette A Memory Medallion on a gravestone.
‘The concept of barcodes on tombstones and interactivity at the cemetery was considered too far-fetched when Glenn Toothman first traveled to funeral industry conferences 10 years ago. “Nothing in the death-care business happens too quickly,” he said. After years of waiting, technological developments have finally allowed Mr. Toothman to get to a point of “rebirth” for his Waynesburg company, the Memory Medallion.’
Read more: http://www.post-gazette.com/pg/10218/1078084-28.stm#ixzz1RAfkN7ab
I think the memory medallion is a nice & tasteful way of adding the bar code info, keeping the traditional appearance of the headstone.
regards,
Theresa (Tangled Trees)