We review recent NLO QCD results for W,Z 3-jet production at hadron colliders, computing using BlackHat and SHERPA, and including also some new results for Z 3-jet production for the LHC at 7 TeV. We report new progress towards the NLO cross section for W 4-jet production. In particular, we show that the virtual matrix elements produced by BlackHat are numerically stable. We also show that with an improved integrator and tree-level matrix elements from BlackHat, SHERPA produces well-behaved real-emission contributions. As an illustration, we present the real-emission contributions ---including dipole-subtraction terms---to the p_T distribution of the fourth jet, for a single subprocess with the maximum number of gluons. Show Partial Abstract