I've done a 3 part video tutorial on how to get brighter colors and sharper details in a photo. These methods are variations of what is outlined in the Flickr group Photoshop Support Group. This is the place to go for helpful advice without the flaming of newbies that goes on in other places. A very friendly place.
Part 1:
Enhance the colors by adding a curves adjustment layer and use the layer mask and opacity to control the effect.
Part 2:
Duplicate the background and sharpen the photo. Use a mask to keep parts from getting over sharpened. It is rare that one level of sharpness works across the entire photo.
Part 3:
An alternate approach to the curves shown in part 1.
