  During the 1990s an international collaboration has been studying the
possibility of constructing and operating a high-energy high-luminosity
$\mu^+\mu^-$ collider. Such a machine could be the approach of choice to extend
our discovery reach beyond that of the LHC. More recently, a growing
collaboration is exploring the potential of a stored-muon-beam "neutrino
factory" to elucidate neutrino oscillations. A neutrino factory could be an
attractive stepping-stone to a muon collider. Its construction, possibly
feasible within the coming decade, could have substantial impact on neutrino
physics.
