If you were at //build/ this year, you probably remember tapping your badge on a reader before picking up your free Surface and Nokia Lumia 920 devices. It turns out, the badge hides NFC tech as opposed to that boring ol' RFID stuff.
Tear down photos follow.
I managed to steal a badge from some random chump.
Acetone made quick work of the plastic badge... Wait, what's that?
NXP MIFARE Ultralight NFC IC
But what secrets does it store within? Sadly, the tag doesn't appear to have been NDEF formatted so reading it with Windows Phone is out. (It is detected just fine, though.) I ordered an ACR122T reader/writer to lend a hand so check back in a week or so for the big reveal.