Mobile space, time and context

This is a theoretical paper on mobility which proposes a taxonomy of mobility, consisting of spatial, temporal and contextual aspects. There's some interesting discussion of how mobile devices change the use of time and the perception of time. Another idea listed is to plot technologies on a graph with axes of unobtrusive to intrusive and ephemeral to persistent.

Mobility: An extended perspective, 2002
Masao Kakihara, Carsten Sorensen
[Full-text pdf]