  The PHENIX experiment uses semileptonic decay channels to measure open and
closed heavy flavor cross sections across the rapidity range $-2.2 < y < 2.4$.
High luminosity data are now available for p+p, d+Au, Cu+Cu and Au+Au
collisions at $\sqrt{s_{NN}}$=200 GeV, and for Au+Au collisions at
$\sqrt{s_{NN}}$= 62 GeV. We discuss recent d+Au results for open heavy flavor
and $J/\psi$ production, and discuss their implications for the cold nuclear
matter contributions to heavy flavor production in heavy ion collisions.
