I have Paint Shop Pro 9. I bought it when it first came out years ago and am still trying to learn stuff from it.
Picnik is great to use and it is free. It is just gets real slow after you have done about 6-8 pics. Picnik - edit photos the easy way, online in your browser
A member from here posted this site as well and it is very good and free. I am still learning how to use it. I like that you can watermark all of your pics at one time. FastStone Photo Resizer - Powerful Image Converter/Resizer