From what I've been reading there are three ways to buy precious metals:
Also, my own research suggests that silver bullion is a better investment than gold bullion (and has been in recent history). It requires much more space to store, however it's also easier to divide into weights corresponding to daily purchases.
2) Minted coins - ostensibly for collectible value but are also more easily trade-able. Silver or gold eagles or coins from various countries.
3) Bullion - silver 1000 oz bars have little premium over the spot price. Smaller denominations do, in either case you would want to get the bullion from a recognized mint.
Silver has been money for longer than gold has been money. It follows the gold market usually pretty well. Last Nov-Dec-08 gold began rising and silver didn't immediately follow. I think it has been correcting that gap recently.
Precious metals ought to be in everyone's asset mix - at least 10-20%. Since Obama is spending and inflating more PMs should be accumulated defensively.
With powerful worldwide parties looking to diversify out of the dollar, the idea of a gold based one seems to me to make the most sense. On the other hand the notion that a few other fiat currencies can be strapped together and weighted as a bundle of alternative fiat currencies is just a useless idea. We trade off one governments incredulous fiat currency performance for a basket comprised by other incredible central bankers with their political agendas. That would be sick. Only a hard-currency backing will work for replacing the dollar.