Mastering Perl/Tk is a very good book; meaning that it's a tiny bit of a disappointment as a part of "The Menagerie". The first part of the book seems to be a rehash of Learning Perl/Tk, and the rest of the material is somewhat haphazardly organized--it's all there but can sometimes be difficult to find.
Having said that, this book is a vast improvement over the TK::* perldocs, and contains numerous useful (and reasonably well explained) examples, tips and techniques.
The book also contains some real nuggets--not always directly related to Tk; the example app for downloading comic strips has a wonderful digression on creating non-blocking network processes in a Microsoft Windows environment.
The reference material is very useful, and more up to date than the "Pocket Reference" (but at 746+ pages, you won't be slipping this book into the back pocket of your jeans.)
All in all, Mastering Perl/Tk is a good buy if you need or want to learn and use Perl/Tk. Read it cover-to-cover, then be prepared to flip through the index.
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