At E3 a couple of weeks ago, some attendees were given promo cards bearing the URL www.gorgonbox.com. At first glance, it appears to be an online encoder/decoder to send secret messages to your friends, but delving deeper it appears there is a puzzle trail of sorts, waiting to be explored.
More than likely Gorgon Box is a marketing website for an upcoming videogame, but if you enjoy puzzle trails you should have some fun with it.
EDIT: Players have already started to unravel the mystery, and this looks to be fairly interesting so far.
Discussion at UnForums
