  The past few years have seen many advances in our understanding of the
dynamics of polymeric fluids. These include improvements on the successful
reptation theory; an emerging molecular theory of semiflexible chain dynamics;
and an understanding of how to calculate and classify ``phase diagrams'' for
flow-induced transitions. Experimentalists have begun mapping out the phase
behavior of wormlike micelles, a ``living'' polymeric system, in flow: these
systems undergo transitions into shear-thinning or shear-thickening phases,
whose variety is remarkably rich and poorly understood. Polymeric ideas must be
extended to include the delicate charge and composition effects which conspire
to stabilize the micelles and are strongly influenced by flow.
