Manage Your Portfolio In Today's Rout; Sell F, TWTR, BRK.A; Buy Du Pont Pfds; Write Calls on XOM

What to do right now? In the midst of a 500 point drop in the DJIA and the major indexes falling through their late-August "Flash Crash" levels I have seen several articles today advising investors to "do nothing."  That's dead wrong.  Days like today are proof of the benefits of active portfolio management, not its opposite.