Correcting exposure will solve much basic color problems, but Photoshop’s extensive range of color correction tools can easily handle any that are left over. For example, overexposure or poor lighting conditions can give a photograph a distinctly washed-out look, which may persist when the initial fault is fixed. Photoshop offers several ways of boosting color.
One [...]

This technique is a contrast/tone and color correction technique all in one. Once you run through it, you will see how just about any image can be improved. This is a very useful technique and can be implemented in so many times.

Here is a 2 minute color correction technique picked up from one of Scott Kelby’s books. Its fairly simple, and it ranks as beginner-advanced.  Here is the basic image before color correction.