Eli Bendersky's website As its name suggests, this book is about Perl programming in the Win32 environment. Although Perl was originally created to serve as a script on Unix machines, its usability and power quickly attracted programmers and system administrators on other systems.
Perl is probably the most popular language for Unix sys-admins, and in this book Dave Roth tries to show how Win32 sys-admins can benefit from Perl to automate many of their daily tasks. The topics discussed are machine / network administration, file management, data access, permissions and so on. But not only sys-admins can benefit from the book - it is aimed at the generall programmer using Perl on a Win32 environment (like me :-)). For this, there are a few interesting sections dealing with process management, communication and developing Perl extensions.
I wouldn't say this is one of the best books out there, but overall it's not bad. If you are a sys-admin in a Windows network, this book is probably a must. If you're just a Perl programmer writing scripts and general purpose applications, you can spend your money in a better way.