Did you know that Google makes a program for managing and editing pictures? The app (Picasa) has most (all?) of the main photo editing features the typical person would would be interested in using for quick picture touch ups.
After installing Picasa the first thing it does is scan your computer for images files allowing you to browse all of your pictures in Picasa rather than having to search for the picture you want to work with. The file browser portion of the program is easy to use. All of the pictures are laid out by folder and have good sized thumbnails so you can see what the picture is without opening it.

When you click the image you want to work with it opens up the picture and gives you a set of basic filters you can apply to the picture such as Crop, Straighten, Redeye, etc. These filters are quite good at doing what they are supposed to.

The next tab over allows you to adjust lighting in the picture with several slider bars. Again they make it quite easy to adjust settings.

The last tab has a set of effects that can be applied to your pictures with the click of a button. Just click the effect you want and it is applied. Picasa has everything from a sharpen effect, to a sepia effect, and even a soft focus if you want to draw attention to a specific feature in the image.

All in all Google’s photo organizer is a very feature rich program that allows you to manage and edit your photos all in one application, and to top it off it’s free.