Current phenomenological studies of jet observables at colliders are clearly
limited by the theoretical uncertainties inherent in the next-to-leading order
QCD description. We discuss the recent progress made towards the calculation of
QCD corrections to jet observables at the next-to-next-to-leading order in QCD
and highlight future perspectives and yet open issues.Comment: 6 pages, LaTeX, Invited talk at RADCOR2002/Loops and Legs in Quantum
Field Theory, Kloster Banz, German