Aram Bartholl has decided to track the evolution of technology in society using a particularly ingenious stratigraphic record: the worn, faded marks left on denim blue jeans. It's just a stated intent, right now: his entire gallery consist of a single picture of the mark of his ancient Nokia 6600, carried in the left pocket from 2005-2008. It's a great idea, and I'd love to see more people contribute to this project... so if you've got some old tech-worn jeans, throw up a picture.
As for me, the crotches of the cheap jeans I deign to buy always fall out long before tech can make any real impact on their patina. Although I suspect the iPod Classic shaped callus on my left buttock would serve the same techno-paleontological purpose.