Choosing photo editing software is a personal choice. Some (like me) want to have a LOT of creative control. Others just want something simple that lets them crop the image and get the red eye out. Personally, I enjoy using Photoshop. It enables you to take an ordinary photo and make it extraordinary by cropping it, adjusting the levels, contrast, color balance, color saturation, etc. There are a ton of "plugins" you can get to make it even more fun. Photoshop, however, can be expensive to dive into.
There are several other (FREE) photo editing programs that you can use. GimpShop and Sumo Paint were both designed to work very much like Photoshop:
GIMPShop:
http://www.gimpshop.com/index.shtml
Sumo Paint 2.2.
http://www.sumo.fi/flash/sumopaint/index.php This is a paint program AND photo editing program. You don't have to download it; you just use it online. Here are the instructions/Table of Contents:
http://www.sumopaint.com/help/ For only $19/yr you can upgrade it to Sumo Pro:
http://www.sumopaint.com/pro/
Here are some other popular (and free) web based alternatives to Photoshop that you can check out, along with some info about each:
http://www.lifeclever.com/10-free-web-based-alternatives-to-photoshop/