Building Blocks of Rock®
is a free web app for guitarists - a visual library of hundreds of the most used shapes in rock.
Chord licks - and variations, like hammer-on 5th string for G chord ("The Joker", "Takin' It Easy")
Riff shapes - are often single note licks with chords, like bent 6th string with A chord ("We Will Rock You")
Lead guitar - sound like you're playing more then just scales ("Pride and Joy", "Free Bird")
Music theory - Flip a switch to show the tones in each shape. Example: chord inversion (third in bass).

See "the Building Blocks of Rock"