I'm trying to think of favorites of mine that haven't been mentioned yet, but you gotta go with Hendrix. So Hendrix and...
Stephen Malkmus-love his solos on his solo stuff, Pig Latin and Face the Truth
Jim O'Rourke-everything he does, but especially Loose Fur
Steve Cropper-Stax records session guy that played on ALL of the Stax hits, along with Booker T, Duck Dunn, etc.
Wayne Krantz-Okay-Angular jazz stuff
Nels Cline-I don't care if Wilco has sucked for awhile, everything he touches is great and I especially like/miss the Nels Cline Singers
Spanky Alford-Loved his live work in the early D'Angelo days and he's a rhythm and taste machine