Players from all genre's will benifit from the free country and chicken pickin video lessons on this site.
Free lessons include country scales, the familiar double stops and hybrid or chicken picking. There is also a tutorial for a unique technique that Ken calls "Chattahoochie".
Aside from the lessons, the site also has useful tools that will help you in your learning. There is a section for chord charts and there is even a metronome and tuner.
You can also check out Ken Carlson's instructional DVD's which are available for purchase.