In a Nature Materials paper last year, Alan Heeger's group at UCSB considered the electric field and temperature dependence of the current in an organic field effect transistor. They fitted the observed dependence to that for a theory which describes slightly dirty long one dimensional conducting wires with strong electronic correlations (Tomonaga-Luttinger liquid theory). This theory gives a good description of charge transport in single carbon nanotubes. However, it is not clear if there is a physical reason to expect the TLL theory to be relevant to "dirty" crystals of small organic molecules.
However, Worne, Anthony, and Natelson show that for their data on similar devices the curve fitting to the TLL theory is problematic. In particular, the apparent "scaling collapse" is fortuitous. They state:
decreasing T moves subsequent temperature data sets up and to the right on the graph, even if the data themselves do not change with temperature at all. In fact, any weakly temperature dependent dataset that resembles a power-law can be made to fit onto a single line if plotted in this way with an appropriate choice of α. Data collapse with this plotting procedure is not sufficient to demonstrate TLL physics.
There is another reason why I am skeptical about any claim of "metalllic" behavior in these systems. Their mobility is much less than than the "minimum mobility"of 1 cm^2/Vsec that is necessary for the coherent transport associated with delocalised electrons and band structure.