At risk of lapsing into a school-yard "Who's the best. . ." tiff,
For impressive fast fret-board work and hammering-on;
Acoustic: Tommy Emmanuel (Australian, but awesome)
Electric: Nuno Bettencourt (Remember "Extreme" - check out the lead 8 on "Song for Love") or Eddie Van Halen before he became Pope
For lilting, melodic soulfulness:
Acoustic: Either Ben Harper or early Jack Johnson
Electric: Martin barre
Biggest hair and ******** poncing about:
Stevie Vai
And for Bar Chords with accidental bum notes, damped strings and fret buzz
ME!
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"I started out with nothin' and I still got most of it left" - Seasick Steve