Headmap
“The space, the social network, thinking tools and the network interface in the same field of view. The boundaries between what is interior and what is exterior intersecting tangibly in front of your eyes.”
If you have interest in continuous computing, location aware devices, social computing, or similar stuff check this out. At least start reading it. I just started, and it is amazing me. It has a lot of good ideas about where we can take the location sensing technology. The PDF is linked to on the left of the main page.