This is an excellent series of podcasts on Guitar Music Theory available for free on iTunes. Taught by Desi Sarna, the author of Fretboard Theory, they are best for intermediate and advanced players. Lessons include pentatonic and major scale patterns, chord inversions and arpeggio patterns with the CAGED system.

Desi Serna - Guitar Music Theory Lessons - Desi Serna - Guitar Music Theory Lessons - Desi Serna