Nylon picks have always been most popular amongst acoustic players because of the low pick noise from their softer surface.

Used by:
Eric Johnson
Mick - Slipknot
John Petrucci - Dream Theater
Billy Howerdel - A Perfect Circle
Sarah McLachlan
Benji Madden - Good Charlotte
Dolores O'Riordan - Cranberries
Radiohead
Troy Van Leeuwen - Queens Of The Stoneage
Michelle Branch
Johnny Marr
Jane Wiedlin - Go Go's