My critique of gold and silver:
Gold: Will always hold value. A small fortune may be transported with ease. It has almost universal recognition of value. In a really bad "Collapse of the Roman Empire" scenario where we get plunged into the dark ages, gold can get you large quantities of food, housing, horses etc or perhaps even an escape to somewhere better. In the event we get a protracted depression but are atleast partially saved (notwithstanding a 0-60% dieoff) by an oil alternative, your gold will still comparatively have the same value.
Silver: "Poor man's gold." It holds similar bonuses to gold in that it retains value and can be used in either a powerdown or an apocalyptic peak oil future. It has the benefit of having more utility in small transactions (a 1/20 oz coin is still worth approx $33). However, silver is EXTREMELY bulky to transport. 50 ounces of silver @ $13 is worth the same as 1 ounce of gold @ $650.
ETF's are BAD. It is a promise to pay the bearer on demand gold. In a real SHTF scenario, I want the real thing, not a piece of paper saying I have gold hundreds of miles away. Mining companies may fold without fossil fuels, and obviously this is bad news for shareholders.
Land: In the neo-feudal fantasies of some of you (if they play out), land will be the means of creating wealth.
The only modern currency you might want to look into is the swiss franc. Unfortunately, in the year 2000, the Jews ruined the currency (in my eyes) by pressuring the Swiss to take the money off it is 40% backing by gold, claiming some of it was Holocaust gold. Ultimately, the US dollar's ruination will bring down all other fiat currencies.
Only a city man would carry a bag of iron instead of a bag of rice.
-Ling Tan, from the movie Dragon Seed, 1944 (more wisdom from Turner Classic Movies)