  After briefly reviewing how the symmetries of the Standard Model (SM) are
affected by neutrino masses and mixings, I discuss how these parameters may
arise from GUTs and how patterns in the neutrino sector may reflect some
underlying family symmetry. Leptogenesis provides a nice example of how
different physical phenomena may be connected to the same neutrino window of
physics beyond the SM. I end with some comments on the LSND signal and briefly
discuss the idea that neutrinos have environment dependent masses.
