Hitachi Develops RFID Powder | Wired.com This is just peachy.

Conspiracy-minded types can thank Hitachi for something new to worry about — RFID chips so small you’ll never know they’re there.
The electronics conglomerate recently showed a prototype of an RFID chip measuring a .05 millimeters square and 5 microns thick, about the size of a grain of sand. They expect to have ‘em on the market in two or three years. The chips are packed with 128 bits of static memory, enough to hold a 38-digit ID number.

Adam Curry discussed this on the last No Agenda and I pooh-poohed it. More interesting is the spec that has the dot holding a 38 digit number. Following Moore’s law this storage becomes a dossier or a 155,000 word novel in less than 20 years.