  Although cosmic rays were discovered a century ago, we do not know where or
how they are accelerated. There is a realistic hope that the oldest problem in
astronomy will be solved soon by ambitious experimentation: air shower arrays
of 10,000 kilometer-square area, arrays of air Cerenkov telescopes and
kilometer- scale neutrino observatories. Their predecessors are producing
science. We will review the highlights:
  - Cosmic rays: the highest energy particles and the GZK cutoff, the search
for cosmic accelerators and the the Cygnus region, top-down mechanisms: photons
versus protons?
  - TeV-energy gamma rays: blazars, how molecular clouds may have revealed
proton beams, first hints of the diffuse infrared background?
  - Neutrinos: first results and proof of concept for technologies to construct
kilometer-scale observatories.
