Not wanting to dilute the thread, but check out Youtube for some great white blues guitarists as well.
Such as:
Eric Clapton
Peter Green
Mick Taylor
Joe Bonamassa
Ronnie Earl
Michael Bloomfield
Rory Gallagher
Ry Cooder
Morgan Davis
Johnny Winter
Warren Haynes
Duane Allman
Dickie Betts
Gary Noore
Roy Rogers
Bonnie Raitt
Derek Trucks
Jeff Healy
Danny Kirwan
Colin James
Billy Gibbons
Duke Robillard
Also from time to time:
Jimmy Page
Danny Gatton
Roy Buchanan
Jeff Beck