Carbon Fiber Sprayer Booms
The current edition of SF has a nice article about carbon fiber sprayer booms. They're lighter than steel, can be plenty strong, avoid corrosion, probablly use less powerful hydraulics, should cost a little less fuel.
Nice idea. Probably won't affect my lifetime, but I bet many sprayers will have them in half a dozen years and I bet they become quite popular.
Repairing them might be a little problematic at frist, but anayone can learn to work carbon fiber so it's not a deal breaker.