  There are hints that nearby Type Ia supernovae may be a little different than
those at large redshift. Confidence in the conclusion that there is a
cosmological constant and an accelerating Universe thus still requires the hard
work of sorting out potential systematic effects. Polarization data show that
core-collapse supernovae (Type II and Ib/c) probably depart strongly from
spherical symmetry. Evidence for exceedingly energetic supernovae must be
considered self-consistently with evidence that they are asymmetric, a
condition that affects energy estimates. Jets arising near the compact object
can produce such asymmetries. There is growing conviction that gamma-ray bursts
intrinsically involve collimated or jet-like flow and hence that they are also
strongly asymmetric. SN 1998bw is a potential rosetta stone that will help to
sort out the physics of explosive events. Are events like SN 1998bw more
closely related to "ordinary" supernovae or "hypernovae?" Do they leave behind
neutron stars as "ordinary" pulsars or "magnetars" or is the remnant a black
hole? Are any of these events associated with classic cosmic gamma-ray bursts
as suggested by the supernova-like modulation of the afterglows of GRB 970228,
GRB 980326 and GRB 990712?
