A little messin around with different tools can go a long way JG...the lessons you learn will be invaluable...each tool has a specific purpose, and can normally be manipulated some to bring about a certain look...MO likes to use the dodge and burn tools when possible, I am partial to the "curves" tool, so much so that I would gladly pay good money for it and it alone...because it give me control of both highlights and shadows of any given area...
Here is a simple and quick tutorial on a different way to do MO's pic from above...using my fav tool...
!. In image 1 I have selected the selection tool (in this case the lasso tool), and will select the area I want to change..
2. In image 2 I have clicked on the "Quick Mask" tool, which shows me in graphic terms the area I have selected and the amount of feather/falloff that will occur...sometimes you get it right on the first try and sometimes not...what I see here is that the area is not sufficient, nor is the amount of feather/falloff...
3. In image 3 I have gone back in and re-selected an area that is more to my liking...and set the feather at 50px instead of the original 20...I did this so the feather would be more gradual...
4. In image 4 I am ready to start making changes to the image, and I click on "image", then "adjustments", and then "curves...opening the curves dialogue box...CS3 and above have a histogram built into this box, CS2 and below do not...using the curves dialogue box I can change both the highlights and shadow exposure in the selected area...
5. This is the fun part...In image 5 I simply move the black point up with the cursor, to lighten the selected area, and the entire exposure changes, and as this happens you can easily see whether or not there is enough feather to suit your needs for this picture...if not just adjust the amount of feather and reopen the curves dialogue box...and re-execute the change...
6. If your happy with the results then go to the "Select" window and deselect your selection...and you have a finished image...
This is admittedly a very simplified explanation, but the object really is to show there are many different ways to accomplish the same thing in Photoshop...
Maybe we can con MO into creating a sticky where we can either write or find different tutorials and insert them as individual threads as we go...