If you believe that the dollar is toast, then you will be looking to invest in hard assets. (if you don't think that, why exactly are you bothering to stuff every nook and cranny of your home with old dirty pennies?

The most obvious hard asset to flee to during a currency melt down is gold (and it will become even more obvious to more people if/when things get worse). Because it is the most obvious hard asset to flee to, gold is liable to run up well past its inflation "perfect" value. In fact this is exactly what it has done in the past. For example, if the dollar loses 50% of its value from here, gold should rightfully double. However it might very well quadruple in the rush to buy it. And of course this rush works in reverse too on the way down...which is why gold can be so darn volatile at times.
The point being that as our currency crumbles different hard assets at different time will be the best value. Some will get dangerously overpriced (ahead of inflation) and some will lag. For example, most likely in the future there will come a time where if you are bold enough you could exchange your gold for real estate and make a killing. Or for that matter, the beaten down stock of some company that is destined to survive the upheaval.
So if you are able, try to buy low and sell high, and don't forget to diversify to buffer yourself from the mistakes that we will most assuredly all make along the way.
As always IMHO.