Favourite Guitarists

Plenty more could go on either of these lists.

Prog:

Steve Hackett
Steve Hillage
Steve Howe
Robert Fripp
Franco Mussida (Italian prog great)
Gabriel Federow and James Mac Gaw (from Magma)
Fred Frith (from avant-prog band, Henry Cow)

Jazz:

Allan Holdsworth
John McLaughlin
Mary Halvorson
Alex Machacek
Ralph Towner
Pat Metheny
Frank Gambale
Steve Morse
Terje Rypdal

Metal (progressive and technical):

Paul Marsvidal (Cynic)
Daniel Goldenlow (Pain of Salvation)
Ron Jarzombek (Spastic Ink, and Blotted Science)
Robby Bacca (The Contortionist)
Tosin Abasi (Animals as Leaders)
Acle Kahney (Tesseract)

Allan Holdsworth / Masterful technique, otherworldly imagination.

John McLaughlin / Technique galore, emotive and ecstatic soloing. 

Steve Hackett / Great acoustic and electric playing, solos that sound like they are from another planet.

Robert Fripp / phenomenal composer, innovator, player.

Franco Mussida / Guitarist for Italian prog band PFM. Amazing player, with loads of beauty and emotion.

Pat Metheny / Fusion great.

Pat Martino / One of the orginal fusion players. Innovative with technique. Does not get the credit he should.

Steve Howe 

Frank Zappa

Ralph Towner / Ridiculous acoustic technique. Beautiful compositions.

Others: Alex Machacek, Al Di Meola, Paco de Lucia, Steve Hillage, Corrado Rusticci.