Very interesting discussion! I see two separate issues here, each with its own unique answer:
1. How can I hedge against the declining US dollar?
For protecting against a dollar decline I'd prefer investing in a foreign currency over investing in gold or silver. This way you're also collecting interest while your money's just sitting around. I like the "Currency Shares" ETF's. You can buy and sell them as easily as a stock, and they pay interest on your balance. You can see the symbols, current prices, and current interest rates for each here: http://www.currencyshares.com/ . I think the Euro (ticker symbol FXE) is a good place to stash some cash while the dollar's going down. If you're dead set on gold or silver check out the GLD and SLV etf's. They offer an easier way to buy and sell gold and silver if you don't mind not actually possessing the physical bars.
2. How can I protect myself if the poop hits the fan, banks close, dollars and paper assets become worthless?
For this you'll probably want to be in physical possession of gold or silver. In the unlikely event that everything goes really bad then pieces of paper saying that you own some gold in another state or some Euros in London are going to be next to worthless. To prepare for an event like this, you should get some gold and/or silver coins (not bars) and keep them somewhere safe, but close and available (home safe, safety deposit box...) I recommend coins and not bars because if currency becomes worthless it will be pretty hard to get change when bartering for food or gas with a $10,000+ gold bar. Go for well-known and easily recognizable gold coins with the weight stamped on them, such as American Eagles or South African Krugerrands. This will make it easier to convince people of their authenticity and value when you try to use them.
So, in summary, here's what I'm personally doing: I have some cash in FXE (Euro ETF). This cash is gaining in value as the Euro gains against the dollar, and is earning a small amount of interest as an added bonus.
Also, I have a safe stocked with gold and silver coins just in case. I understand that I'll most likely never need to use them, but I figure it's better to be safe than sorry. Call me crazy if you want. The safe also contains a gun and plenty of ammo, again, just in case.
1. How can I hedge against the declining US dollar?
For protecting against a dollar decline I'd prefer investing in a foreign currency over investing in gold or silver. This way you're also collecting interest while your money's just sitting around. I like the "Currency Shares" ETF's. You can buy and sell them as easily as a stock, and they pay interest on your balance. You can see the symbols, current prices, and current interest rates for each here: http://www.currencyshares.com/ . I think the Euro (ticker symbol FXE) is a good place to stash some cash while the dollar's going down. If you're dead set on gold or silver check out the GLD and SLV etf's. They offer an easier way to buy and sell gold and silver if you don't mind not actually possessing the physical bars.
2. How can I protect myself if the poop hits the fan, banks close, dollars and paper assets become worthless?
For this you'll probably want to be in physical possession of gold or silver. In the unlikely event that everything goes really bad then pieces of paper saying that you own some gold in another state or some Euros in London are going to be next to worthless. To prepare for an event like this, you should get some gold and/or silver coins (not bars) and keep them somewhere safe, but close and available (home safe, safety deposit box...) I recommend coins and not bars because if currency becomes worthless it will be pretty hard to get change when bartering for food or gas with a $10,000+ gold bar. Go for well-known and easily recognizable gold coins with the weight stamped on them, such as American Eagles or South African Krugerrands. This will make it easier to convince people of their authenticity and value when you try to use them.
So, in summary, here's what I'm personally doing: I have some cash in FXE (Euro ETF). This cash is gaining in value as the Euro gains against the dollar, and is earning a small amount of interest as an added bonus.
Also, I have a safe stocked with gold and silver coins just in case. I understand that I'll most likely never need to use them, but I figure it's better to be safe than sorry. Call me crazy if you want. The safe also contains a gun and plenty of ammo, again, just in case.