"There's no doubt about it: vital resources are in a bull market of gigantic proportions," note Yiannis Mostrous and Roger Conrad.

"The co-editors of Vital Resource Investor caution that "no market moves in a straight line, and in commodities, the action is often extremely violent." However, for long-term investors, they offer some favorites in iron ore, aluminum and copper.

"All commodity bull markets are ultimately gored by demand destruction, alternatives and new supply. But it will almost certainly be years before that happens to this one. And that means plenty of money will be made along the way.

"We're still extremely bullish on iron ore as the market remains in deficit and prices continue to rise. Chinese domestic supply has been falling and, if this continues, imports will make up the difference, thereby helping the miners.

"China consumes 51% of the world's iron supply. Portfolio holding Companhia Vale do Rio Doce (NYSE: RIO), the world's largest iron ore producer, will benefit from the shortage in iron ore supply.

"We favor aluminum in the industrial metals sector. We've been advocating aluminum for some time, and the market's finally going our way. Aluminum prices have been impacted by lack of available power in China and South Africa and higher alumina and bauxite prices.