Well, since I've bumped into another 9/11 conspiracy nut who ranted on about the fiat money standard, I thought I'd attempt to cover some basic economics from what I remember in my high school classes, since many woos don't seem to recall even that level study. I've heard some people complain about the "fakeness" of fiat money, which is what we're currently on here in the US: Those green slips of paper and those numbers in your bank account are valuable because we say so. For the people who complain about the fakeness of that and want us to get back onto the gold standard, there's a little something I need to drill into your head:
The value of gold is just as fake.
Precious metals are only really precious because we agree they're precious. Sure, gold has some value for electronics, since it's a good conductor and is very resistant to corrosion, but stuff like that's only recent in human history: Gold is seen as valuable because it's shiny and rare. That's about it.
For a long time, gold and silver have been good enough to serve as a medium of exchange because they can't be duplicated (sorry, alchemists), they're scarce enough to be conveniently small, and still common enough that you could mint coins and such for public use. That's not much different than paper money: US currency is difficult to counterfeit (duplicated), it's scarce enough to be meaningful, and there's enough of it to be used by the public. That can be subject to change with fiat money, since the government can increase minting or someone can hoard the money, taking it out of circulation. Of course that's not much different than with notes backed with precious metals: How much is "a dollar worth of gold" anyway?
Fiat money just takes out the middleman of shiny metals.
As for the government supposedly taking away the value of a dollar by simply no longer accepting it for transactions, well, that's their loss. How are they going to convince the guy at my local comic shop not to take my dollars in exchange for packs of cards? That's about the same as convincing a nation of internet goers that kitten videos aren't cute. Money is a human construct based on our emotions and perceptions, not a tangible thing.
I play Magic. I have some cards that are worth a fair amount of money right now. A couple decades from now, the game could very well stop being popular enough to justify printing new cards. At that point, a card in my collection, which hasn't changed at all, could very well cease to have any value beyond being a very thin drink coaster. For the government to kill the value of the US fiat dollar, they'd have to somehow make it profoundly unpopular.
Back on the topic of overprinting cash: I'm pretty sure if the government tried that in an effort to devalue the dollar, they'd have mass riots and revolutionaries to deal with on every class level, and probably plenty of foreign intervention, since a lot of overseas businesses use US dollars. Not exactly a competent thing to do if you're trying to control people.
Since my economic education's just limited to high school, some marketing classes, and some rational-seeming blog posts, feel free to bring up points I might have missed.
Possible next entry: The myth of fixed value.