Abstract
It is a clear unique prediction of the cold dark matter paradigm of
cosmological structure formation that galaxies form hierarchically and
are embedded in massive, extended dark halos teeming with self-bound
substructure or "subhalos". The amount and spatial distribution of
subhalos around their host provide unique information and clues on the
galaxy assembly process and the nature of the dark matter. I will
present results from "Via Lactea II", the most recent in a series of
high resolution numerical simulations of Galactic CDM substructure,
with a particular focus on the possibility of GLAST detecting
gamma-rays from DM annihilations in the centers of subhalos.