  We study a system of intersecting NS and D-branes in type IIA string theory
in R^{9,1}. We show that the 3+1 dimensional non-supersymmetric theory at the
intersection has unstable vacua which are long-lived in some regions of the
parameter space of brane configurations, and disappear in others. We also
comment on the relation of our construction to systems of D and anti D-branes
wrapped around cycles of non-compact Calabi-Yau manifolds and to other related
systems.
