I think that dual-carders are really great as a concept and I agree with CL that they differ from "entryist" tactics. I think that there is no one way to build class consciousness in the working class. If that comes through organizing the unorganized or the "unorganizable" (undocumented workers, unofficial work, casualized labor) then that's great. If it comes through agitation by workers in an already organized shop, that's great. If it comes through consciousness-building off the clock (activist work, community organizing) that's great too.