  Recent signals for narrow hadrons containing heavy and light flavours are
compared with quark model predictions for spectroscopy, strong decays, and
radiative transitions. In particular, the production and identification of
excited charmed and cs states are examined with emphasis on elucidating the
nature of $0^+$ and $1^+$ states. Roughly 200 strong decay amplitudes of $D$
and $D_s$ states up to 3.3 GeV are presented. Applications include determining
flavour content in $\eta$ mesons and the mixing angle in $P$ and $D$ wave
states and probes of putative molecular states. We advocate searching for
radially excited $D_s^*$ states in B decays.
