A company called Somark Innovations has successfully tested an RFID "tattoo" on cows, mice and rats. An array of needles is used to inject a passive RFID ink which can be read at a distance of 4 feet. Looks like this will be used for branding cattle and...military personnel. More info at The Register and Engadget. Now if this isn't the "mark of the beast", I don't know what is. ;)
I wonder what other applications they'll think of? They already use RFID to process credit card transactions ("Paypass") and are pilot testing the same payment system for use in the subways here in NYC. Now if you can get a tattoo of your baby momma's name on your neck and pay for your beer/cigarettes/lotto tickets by banging your head on the cash register..that would be something.