Teach Yourself Graphic Design – Self-Guided Tut
A nice piece from PSD Tuts:
Fortunately, it isn’t required to go to design school in order to be a graphic designer. A good foundation in graphic design history, theory, and practical application will help you hit the ground running. There are plenty of resources available in which you can learn graphic design on your own. Don’t set your expectations to high at first, as it will take enthusiastic study for years to become great. You can do it though!
If you would like to learn graphic design from the ground up, through self directed study, then this article lists some great resources that will get you started with your design education. Also, even if you do go to design school, at least three-fifths of your education will be through self directed study anyway.