The cosmic microwave background and observational convergence in the Ωm-ΩΛ plane

I use the most recent cosmic microwave background (CMB) anisotropy measurements to constrain the leading cold dark matter models in the Omega(m)-Omega(Lambda) plane. A narrow triangular region is preferred. This triangle is elongated in such a way that its intersection with even conservative versions of recent supernovae, cluster mass-to-light ratios, and double radio source constraints is small and provides the current best limits in the Omega(m)-Omega(Lambda) plane: Omega(Lambda) = 0.62 +/- 0.16 and Omega(m) = 0.24 +/- 0.10. This complementarity between the CMB and other observations rules out Omega(Lambda) = 0 models at more than the 99% confidence level.