Watch the Low Down online guitar lesson by David Hamburger from Blues Alchemy
Gatemouth Brown is another great source for hot electric open-position ideas. Brown plays everything with a capo, so no matter what key he's in, it's like he's playing in the key of E in open position. He plays with a combination of thumb and fingers, occasionally doing some heavy palm muting as well. Those open-position big-band style chord hits in the very last chorus here are straight out of Gatemouth - although you can also hear B.B. King use them further up the neck.