The results of recent transport measurements in the spin-density wave
(SDW) state of the Bechgaard salts (TMTSF)2X [X = PF6, AsF6, SbF6, or
(AsF6)(1-x)(SbF6)x] are summarized. The weak nonmagnetic disorder intr
oduced by the alloying of two kinds of anions increases the depinning
threshold by up to 3 orders of magnitude. The damping of the low-frequ
ency phase mode decreases exponentially with increasing temperature an
d saturates at a constant value determined by the disorder at high tem
peratures. The dc nonlinear conductivity disappears at low temperature
s, and this behavior is not explained by the increasing damping. From
Hall effect measurements we find a strong coupling between the SDW and
normal electrons