I have reviewed a book that teaches the basics of music theory over at my educational book reviews blog. I recommend everybody have a read of it because you may find it useful. Although I will be creating lessons on music theory in the future, you may want to start learning about it now.
Music theory is essential for every guitarist to know. It doesn’t matter if you’re playing rock, metal, country, blues, classical, flamenco or any other style, you will be better off learning music theory. Many people neglect this area and don’t realize that they are putting themselves at a disadvantage. So whether you read this book or another, be sure to start learning about music theory as soon as possible.
Have a read of the review here http://educationalbookreviews.blogspot.com/2009/04/book-review-complete-idiots-guide-to.html