With another round of margin increases for gold futures traders, Gold prices plummeted today. Commodities were the most volatile sector of our markets by far, and may present some good trading opportunities for short term as well as Long term investors. John O’Donnell shares his thoughts on his favorite precious metal, as well as the condition of the global financial markets. Financials also took a beating, helped out by some downgrades of major banks like BAC and WFC. PowerPick: DOW