The 2nd edition is up-to-date with Tcl/Tk 8.0The 2nd edition describes Tcl/Tk 8.0 and has chapters that summarize the changes between Tcl 7.4/Tk 4.0 and the current releases. I note that my publisher says the book covers the "new Tcl 7.5 / Tk 4.1" releases, which are actually quite old. I work in the Tcl/Tk group at Sun and have the inside track on what it offers.
There is a typo on the back cover. My home page url should be http://www.beedub.com/
This is a practical, comprehensive tutorial for programming in the Tcl scripting language and the Tk X toolkit that is based on Tcl. This provides a Motif-like look and feel without much of Motif's complexity. The book provides an introduction to Tcl programming, including tips on problem areas and strategies for effective use of the language. The examples demonstrate how to use the toolkit features, and are useful in their own right for programmers constructing new applications. The use of X resources is explained in detail, and all code is provided, both in text and on a floppy disk containing files in UNIX tar format.