http://www.amazon.com/exec/obidos/tg/detail/-/0130385603/qid=1046168352/sr=8-1/ref=sr_8_1/104-7014893-7300739?v=glance 

Authors: [Brent Welch], [Jeff Hobbs], [Ken Jones]


This book is now available.

This book is up-to-date with Tcl/Tk 8.4.

The book's home page is http://www.beedub.com/book/

There are about 20 sample chapters available at [http://www.beedub.com/book/]
taken from the 4 editions.  They cover topics from the basic Tcl and Tk introductions,
through more advanced topics like Regular Expressions, Eval, Socket programming,
Thread programming, TclHttpd, and Starkits.

A few general remarks on the book appear in the review
[http://www.unixreview.com/documents/s=8472/ur0307j/]
by [Cameron Laird], as well as this [http://www.unixreview.com/documents/s=8887/ur0309l/] follow-up review.
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Among its other virtues, the fourth edition explicitly explains use of [Tk] by such other languages as [Python], [Ruby], [Perl], and so on.
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[Category Book]