First diamonds, then buckyballs and carbon nanotubes, but now we have a viable way to manufacture graphene, the next miracle material made strictly from carbon. Graphene is strong, thin, and very good at conducting electricity, which makes it useful for quite a few things. It’s been around for a long time (think pencils), but the problem has been how to manufacture it in a useful form. Expect to see more of this technology in the future.
Update: The linked article no longer exists, so use this one instead.