Here is one of my favourite Videos from Steviesnacks.com. Be sure to check out the rest of the Steviesnacks in the Video section, in particular the "Box" lessons which accompany this post.

Box 2 - The Albert King Box from Anthony Stauffer on Vimeo

Box 3 - The B.B. King Box from Anthony Stauffer on Vimeo.

Box 4 - The Clapton Box from Anthony Stauffer on Vimeo.

Box 5 - The Major Root Box from Anthony Stauffer on Vimeo.

In this free blues guitar video lesson you will learn how to play some nice rhythm guitar. This lesson uses a chord shape that you can move up and down the neck to play three different chords.

Here are the chord shapes used in the video.

The blues progression used is

..and finally the blues video lesson

This lesson explores double stop bends, and results in a great sound. Have a look at Jody Worrell's video demonstration.