It can be confusing trying to learn image-editing software. I think most people struggle because they try to do really complicated things too soon, as with most things you should learn the basics first.

Anyway here is a list of useful sites which I have used in the past which have helped me:

Tutorial Sites
http://www.gimpguru.org/ - A site for GIMP users.
http://tutorialoutpost.com/tutorials.../photo-editing - Quite a few photoshop tutorials.
http://www.good-tutorials.com/ - This is the biggest tutorial site I could find.
http://www.eastofthesun.com/ - For anyone that might use photoimpact.
http://pixel2life.com - As suggested in the "learning photoshop or similiar" thread.

Free Software
http://gimp.org - A pretty good piece of open-source software for begginers.

Other Resources
http://photoshop.weblogsinc.com/ - A blog on photoshop

Please add to this list and then i'll create a new thread with all your submissions.