Craig Blacklock provides a tutorial on how to edit an image in Adobe Camera Raw. If you are not using this technique (which is non-destructive, adds almost no size/weight to the file, and has phenomenal capabilities) - you should be after watching this.
This method has completely changed the way I edit an image (it's the only method I use now). Keep in mind you need at least version 6 of Photoshop/Camera Raw to use the features listed. Enjoy!
If you would like to learn from Craig Blacklock in person, join us on our upcoming Dynamic Nude Workshop at Lake Powell, Utah. This only scratches the surface of the advanced techniques we cover, plus you'll get to work in some of the most beautiful locations on earth (photographing some of the most beautiful people on earth): dynamicphotoworkshops.com/the-dynamic-nude