  We explore a scenario in the Next-to-Minimal-Supersymmetric-Standard-Model
(NMSSM) with both a light O(10) GeV neutralino and a CP-odd Higgs boson with
significant coupling to down-type fermions, evading all current B physics, LEP
and WMAP bounds. Motivated by a possible slight lepton universality breaking
hinted in Upsilon decays, we consider the effect of the mixing of eta(b)
resonances with the pseudoscalar Higgs on the spin-dependent scattering
neutralino cross section off nucleons. We conclude that this mechanism could be
relevant provided that non-perturbative effects enhance the effective
eta(b)-nucleon coupling, taking over velocity/q^2 suppression factors, perhaps
giving a new insight into the current controversial situation concerning direct
search experiments of dark matter.
