Blues Rhythm Riff by Jody Worrell is a free guitar lesson that will get you started on playing blues rhythm guitar. We'll learn a basic rhythm lick that uses sliding double stops. Jody will then show you how to move the lick into different positions to follow a standard 12 Bar Blues progression. The tabs for the whole progession can be found below.
Watch the lesson: Quicktime or Flash
Here is the riff working through the progession.

Blues 101 - Rhythm by Jody Worrell is a downloadable Quicktime video lesson that will teach you the basic concepts of playing rhythm for blues guitar. Jody will teach you nine different blues chords and two different strum patterns with a bluesy feel. We'll play these new chords and patterns with a jam track to help you practice your timing. Included in the downoad is a .pdf with chords charts. $4.99
Watch sample clips: Quicktime or Flash