content: I am unable to categorize this book. As the title says, this is about advanced Perl programming, but chapter 1-9 really belongs in "Programming Perl" (but are totally missing from it), and should really not be considered advanced (on the other hand, quite elementary, but since they appear nowhere else, you should probably consider this book a must read, if you are serious about Perl).The rest of the book is pretty random, covering various topics the author thought was neat, and wanted to write about. This is ranging from trivial use of CPAN libraries (Tk), to trivial Perl but involving knowledge from other disciplines (networking), to actual useful advanced Perl programming (persistence, template-driven code-generation, and the C programming interface). This part of the book is also highly recommended (and in fact the reason I bought it), but should have been much longer.