Online Guitar Lessons

Guitar lessons on YouTube?

So, I know this is cheapskate-ish, but hey, tons of people offer it.

I don't need step-by-step crap, I've been playing violin for years and have taken music theory. I need technical instruction on how to play the guitar.

So, does anyone know of YouTube channels that teach mostly technical aspects of guitar and/or bass guitar?

It could also be from some other video site, but the idea is that it's free.
Thanks.