The 4th edition covers Tcl/Tk 8.4.2. It has new chapters on Tclkit and Starkits, and on the Threading extension. The book includes a CD-ROM with current versions of Tcl/Tk. There is also a collection of Tclkit builds, and a snapshot of the Starkit archive
Sample PDF for the printer. (Grid Chapter)
Sample chapter on Tclkit, Starkits, and Metakit.
Sample chapter on multi-threaded Tcl scripts.
Unix Review review by Cameron Laird.
Errata. If you find an error not listed here, please drop me an email with the details.
Here is a zip file of the examples in the book.
I have had a handful of reports of bad CDs, but supposedly this should be a rare fluke.