I've tended to be bullish on stocks and generally afraid to short, but I think the best way to hold protection is holding 30 yr treasuries (and some gold can't hurt). As fear ramps up, treasuries offer plenty of opportunity. There will be no long end auctions until the end of April and the Fed will be a substantial buyer in between. If the rally does lose steam, treasuries are due to catch a bid. The Fed needs mortgage rates low, so won't let this market sell too hard...