Gold may steal the spotlight when it comes to investing in metals, but there is also silver. And let's not forget "Dr. Copper" -- so named because of its uncanny ability to predict the broad economy. And then -- there are gold stocks, platinum, palladium and aluminum (or aluminum, if you live across the pond). All of these are biggies, and here are some free resources to help you navigate them.
Gold and silver are widely considered classic inflation hedges. But conventional wisdom often does not square with reality. Market observers tend to see what fits with their paradigm. This will change yours.