10 pages, 5 figures - Invited talk at the "Supernova 1987A: 20 Years
  after: Supernovae and Gamma-Ray Bursters" Conference, February 19-23, 2007,
  Aspen, CO, (AIP Conf. Proc.), eds. S. Immler, R. McCray and K.W. Weiler, in
  press. Slightly revised version that clarifies some confusing statements