Here are some links to other guitar educational sites that you may find interesting.
Learn How to Play Guitar | Free Guitar Lessons Online – GuitarPlayerWorld.com
GuitarPrinciples You can be a great guitarist! If you learn how to practice!
CAGED Guitar System Free website explaining the caged system and it’s uses
How to read guitar tabs Free online tutorial. Learn how to read guitar tabs.
Cyberfret.com – Free online guitar lessons using audio and video. This site also features a tablature section and links to many guitar and music resources.