  I give a brief overview of some Quantum-Gravity-Phenomenology research lines,
focusing on studies of cosmic rays and gamma-ray bursts that concern the fate
of Lorentz symmetry in quantum spacetime. I also stress that the most valuable
phenomenological analyses should not mix too many conjectured new features of
quantum spacetime, and from this perspective it appears that it should be
difficult to obtain reliable guidance on the quantum-gravity problem from the
analysis of synchrotron radiation from the Crab nebula and from the analysis of
phase coherence of light from extragalactic sources. Forthcoming observatories
of ultra-high-energy neutrinos should provide several opportunities for clean
tests of some simple hypothesis for the short-distance structure of spacetime.
In particular, these neutrino studies, and some related cosmic-ray studies,
should provide access to the regime $E>\sqrt{m E_p}$.
