Justin Hall's Passively Multiplayer "is a system for turning user data into ongoing play. Using computer and mobile phone surveillance, a user and their unique history. These resulting avatars can be viewed online, and they interact with other avatars online."

Catch his talk at the Seattle 2006 Mobile Games Conference.

A hacked iPod running Linux, running Doom.

AR is a rarified technology, guarded in the crypts of academic research. While several groups have sought to remove the mantle and put AR on the street, much of the medium is still reliant on those silly goggles and half a CRAY computer in the backpack. The people at headmap seek to change that by making consumer grade glasses, with dependent processing in a jacket or backpack. Still, i'm not convinced this is going far enough. AR guru Ignacio Mondine and I were talking about this a few months ago; throwing around the possibilities for using a mobile phone in camera capture mode as a 'looking glass' for a composited layer of 3D content. Ideally the content would be positioned with GPS, or better, using an existing urban mesh-network within a 'live play' or ubiquitous gaming context. Finally someone's cracked it and the possibilites for Pervasive Gaming this opens up are enormous..