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.
