Here is a trick I picked up in my last photoshop class in September with Marlene Hielema. She was a great instructor, very knowledgeable.
One of the great tricks that she showed the class was to fix your colors, shadows and highlights by using curves.
It is a Scott Kelby method of color correcting your photos. It takes a little to do but once you follow the steps you will be quite surprised with the end results.