Mel Bay's Complete Method For Modern Guitar

I recommend Mel Bay's Complete Method for Modern Guitar:

http://www.melbay.com/product.asp?ProductID=93396

This is the book I tend to work from for classical-based lessons i.e. those wanting to learn to read music. It introduces you to the very basic of music theory and notation and then proceeds to work the reader's way round the guitar fretboard at a perfect pace.