location analysis

Grass-users -
  Does anybody out there know of any location/allocation
  analysis that has been done in Grass or other raster
GIS? I know that traditionally location analysis is done on
vector networks, but I am interested in finding out if it
possible to work on problems like "find shortest distance to
and from" in GRASS.
  Any responses would be appreciated!

meh@geog.buffalo.edu

I am also interested in this type of analysis. In particular, I
need to know the minimum distance among a set of locations
given a fixed starting point and an open end point. (a.k.a.--open
loop traveling salesman problem).

Tom Hobbs <nthobbs@ariel.dowfc.colostate.edu>