  Recent results for the spectrum of light hadrons provide clear evidence for
the failure of quenched QCD and encouraging signs that simulations with
dynamical sea quarks rectify some of the discrepancies, although string
breaking has not yet been observed. The use of perturbation theory to match
lattice quark masses to continuum schemes remains questionable, but
non-perturbative methods are poised to remove this uncertainty. The inclusion
of dynamical sea quarks substantially reduces estimates of the light quark
masses. New results for the lightest glueball and the lightest exotic hybrid
state provide useful input to phenomenology, but still have limited or no
treatment of mixing. The $O(a)$-improved Wilson quark action is
well-established in quenched QCD for $\beta\geq 5.7$, with most parameters
obtainable non-perturbatively, in which range scaling violations are small.
Progress has also been made with high-order improvement schemes for both Wilson
and staggered quarks.
