  At variance with fully inclusive quantities, which have been computed already
at the two- or three-loop level, most exclusive observables are still known
only at one loop, as further progress was hampered up to very recently by the
greater computational problems encountered in the study of multi-leg amplitudes
beyond one loop. We discuss the progress made lately in the evaluation of
two-loop multi-leg integrals, with particular emphasis on two-loop four-point
functions.
