Blast Theory

These people are very interesting:
Blast Theory

The group's work explores interactivity and the relationship between real and virtual space with a particular focus on the social and political aspects of technology.

As is this research going on at the University of Nottingham :
Mixed Reality Laboratory

There's also the GPS work going on, with the European Space Agency version:
Galileo. You're sure to have heard of their satellites being blasted into space, but what it should mean is even greater accuracy than the current GPS system.