  The past few years have seen many interesting theoretical developments in
lattice QCD. This talk (which is intended for non-experts) focuses on the
problem of non-perturbative renormalization and the question of how precisely
the continuum limit is reached. Progress in these areas is crucial in order to
be able to compute quantities of phenomenological interest, such as the hadron
spectrum, the running quark masses and weak transition matrix elements, with
controlled systematic errors.
