This free heavy metal guitar video lesson by Peter Vogl will show you how to play several guitar licks. Most of these licks will use double stops which is a combination of two notes played at once. These licks will come out of the Extended C Pentatonic Scale and we'll also practice them over track 7, Rock Ballad in C, of the Let's Jam! Hard Rock.
Watch the lesson: Quicktime or Youtube
Here is the Extended C Major Pentatonic Scale for review

Let's try our first lick featuring double stops

The second lick is basically the same lick but played a little bit differently.

The third lick is another variation of the same principal.

Now practice playing all of the licks over track 7, Rock Ballad in C, of the Let's Jam! Hard Rock.
Eric Johnson Style Licks by Jody Worrell is a downloadable Quicktime video lesson that will teach you some guitar licks in the style of Eric Johnson. Eric has achieved guitar hero status as part of the G3 Tour with Steve Vai and Joe Satriani. In this lesson we'll take a look at Johnson's use of distortion, the major pentatonic scale, and his trademark style of picking every note. We'll cover in detail the techniques involved in playing each lick and then practice them over a jam track. $4.99
Watch a preview: Quicktime or Flash