  The longitudinal and Hall resistances have recently been measured for quantum
Hall bilayers at total filling $\nu=1$ in the superfluid state with interlayer
pairing, both for currents flowing parallel to one another and for
"counterflowing" currents in the two layers. Here I examine the contribution to
these resistances from the motion of unpaired vortices in these systems,
developing some possible explanations of various qualitative features of these
data.
