These free guitar lessons by Peter Vogl will teach you how to use arpeggios to help you solo. We learn to play arpeggios in two different keys and then learn how to switch in between them. We'll use Track 6, Steady in Em, from the Let's Jam! Unplugged CD as a backing track to practice over.
We'll start by learning an Em arpeggio (Quicktime)
Now let's learn a Bm arpeggio that we can play over a Em chord progression (Quicktime)

Now let's learn how to switch back and forth between those two arpeggios (Quicktime)
Sweep Picking by Peter Vogl teaches techniques for sweep picking, some great chord shapes to use when sweep picking, and an exercise attaching these shapes together. This lesson deals with what we like to call long sweeps. $4.99