I'll take a crack at this since no one else answered. These are some books that I've read about lately...
-Getting Started in Commodities by George Fontanills
-Starting Out in Futures Trading by Mark Powers
-Trading Commodities and Financial Futures by George Kleinman
-Futures and Options for Dummies by Joe Duarte
-Schwager on Futures by Jack Schwager
-How the Futures Markets Work by Jake Bernstein
-Gold Trading Boot Camp by Gregory Weldon
Jake Bernstein's book is probably the easiest to read while Schwager's book is kind of "dense".