To realize the vision of embedded or pervasive computing, large scale
deployment of dense ad-hoc sensor networks need to happen. Some of the
deployment may happen by dropping or spraying network nodes in the
region of interest. In this context, we address some fundamental
issues of supporting various networking functions such as naming,
positioning, and forwarding.  We introduce a novel routing technique
called trajectory based forwarding (TBF) for these networks and show
how some common networking functions can be implemented using
TBF. Many of the research challenges that remain will be addressed.