Maintainer of the Tcl on Windows FAQ , located at
http://www.pconline.com/%7Eerc/tclwin.htm
(???) and author of various books, including
BOOK Graphical Applications with Tcl and Tk,
BOOK Linux Programming,
[BOOK Cross-Platform Perl
],
BOOK UNIX Programming Tools,
[BOOK Linux Configuration and Installation
] all of which cover some aspect of Tcl, Tk, or Perl/Tk.