Free Digital Camera Enhancer does the hard job of noise reducing and automatic balance control for you. And it is free!
The program works best if you have bad light condition (indoor, shadows etc..) and your image is somehow off. So if some of your images are already fine, you won't see much difference. DCE makes very delicate changes.
One thing makes DCEnhancer different from other tools - reducing the noise and skin smoothing algorithm. It makes DCE ideal for making cool portraits and close-ups!