Watch the Arpeggios & Lead Playing online guitar lesson by TrueFire from Play Rock Guitar 3: Tools & Techniques
Rock guitar playing makes great use of arpeggios. Whether in a rhythmic part like Van Halen's "Ain't Talkin' 'Bout Love", or a solo from Yngwie Malmsteen, arpeggios are a great tool to have in your bag. Work on these slowly. There are a ton of different ways to approach arpeggios so keep your eyes open to various possibilities!