Rating: 

of Perl/Tk.

It is full of good examples and I have found it very enlightening even

though I have been using Perl/Tk to build very intense applications

for 4 years.

The only thing that jumped out at me was that there was no reference

to the Table widget. Did it fall on the editing room floor?

The explantion of the geometry managers seemed to be expanded from

Learning Perl/Tk which is very helpful as this is one of the most

difficult concepts to grasp for complex UI development.

Revisiting the Towers of Hanoi problem with a Perl/Tk visualization

was a real kick!

Books like this help expose just what a useful package Perl/Tk is and

should be recommended reading for everyone!!