QuarkXPress

QuarkXPress Tutorial
A fairly good tutorial that takes one through more of the advanced aspects of using Quark, complete with graphics.
(http://www.sketchpad.net/quarkbasics.htm)

QuarkXPress Tips #1
Over 20 fairly advanced, but practical tips are listed here that are not commonly known or taught.
(http://www.digitrain.com/Tips/QX.html)

QuarkXPress Tips #2
Over 2 dozen tips on many aspects of designing with QuarkXPress.
(http://www.rit.edu/~spmswww/frank/qxtips/qxtips1.html)