Computations of QCD amplitudes will play an essential role in probing beyond the Standard Model at current and future colliders. Recent developments in the field of perturbative calculations now allow us to more efficiently analytically compute such needed amplitudes. I will discuss how these new techniques of on-shell recurrence relations can be combined with unitary cutting techniques to calculate not only fixed multiplicity one-loop amplitudes in QCD but also all-multiplicity one-loop amplitudes.

SPhT, CEA/Saclay