Author: Brent Welch
WWW book information: http://www.beedub.com/book/
Second Edition Errata: http://www.beedub.com/book/2nd/Errata1.html
Book's examples: http://www.beedub.com/book/tclbook2.tar.Z
Book's table of contents: http://www.beedub.com/book/
Book promotion info: http://www.borders.com/sections/section_50000.html
This updated edition describes Tcl / Tk 8.0 as it was during the beta period. Along with the material from the first edition, it also covers sockets, packages, namespaces, a great section describing the changes in Tcl 7.4, 7.5, 7.6, and 8.0 (and Tk as well), Safe Tk and the Plugin. Note that this book has also been translated:
German translation ISBN: 3827295297
Japanese translation ISBN: 4810185974
Third edition released soon (Amazon says):
Practical Programming in Tcl and Tk by Brent Welch Our Price: $45.00 Textbook Binding - 752 pages 3 Ed edition (November 12, 1999) Prentice Hall; ISBN: 0130220280 This item will be published on November 12, 1999.