  The latest g_mu - 2 measurement by Brookhaven confirms the earlier
measurement with twice the precision. However, interpretation of the result
requires specific assumptions regarding the errors in the hadronic light by
light (LbL) correction and in the hadronic vacuum polarization correction.
Under the assumption that the analysis on LbL correction of Knecht and Nyffeler
and the revised analysis of Hayakawa and Kinoshita are valid the new BNL result
implies a deviation between experiment and the standard model of 1.6 sigma -2.6
sigma depending on the estimate of the hadronic vacuum polarization correction.
We revisit the g_mu - 2 constraint for mSUGRA and its implications for the
direct detection of sparticles at colliders and for the search for
supersymmetric dark matter in view of the new evaluation.
