http://www.tcl.tk/man/tcl8.5/tutorial/tcltutorial.html is a tutorial for Tcl, built upon TclTutor and designed to be included in the distribution.
LV 2007-12-13 Turns out that this is not the case after all. Apparently there was differing expectations concerning the purpose of the tutorial. In any case, the above tutorial was not included in the Tcl 8.5.0 distribution.
LV 2009-Aug-27 In a recent posting to comp.lang.tcl, NEM writes:
...project to update the Tcl tutorial into a book, somewhat along the lines you mention. It's available at http://www.cs.nott.ac.uk/~nem/tcl/tcltutorial/book/html/tutorial.html and is being written as a free Creative Commons licensed resource for the community. Unfortunately, I'm just one rather busy person, so progress comes in dribs and drabs when I find time. Arjen Markus has also contributed the beginning Tk chapters, and some material has been adapted from the original Tcl tutorial (itself based on TclTutor).
A high-quality PDF version is also available for printing: http://www.cs.nott.ac.uk/~nem/tcl/tcltutorial/book/pdf/tutorial.pdf