Yes, generally so. Look at the Dec '07 vs Dec '06 corn contract. People believe ethanol is going to really take off next year and make corn very expensive. The premium for the far contract goes way beyond simple cost-of-carry. If Ethanol doesn't look like it will explode next year, or it becomes cheaper to buy corn now and store it, the dec '06 contract will go up, and the Dec'07 contract will come down.
Look at crude oil and notice that the first delivery is less expensive than the second delivery. So, crude consumers are stocking up on oil because its cheaper to buy now than later. And crude is generally a backward (rather than contango) market.