Unix Network Programming will help you every time you write a network program for the rest of your life. Even though it is written for C, the principles are applicable in Perl -- and a lot easier to use, too.
I warn, however, that it is a very dense text, and will need to be read and tinkered with extensively before the massive dose of information fully sets in.
There is a more recent version of the book which is split into three volumes; I haven't read it, but if that's what is available, then go for Volume 1 to start.
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perlsyntax, glad to have you around, but help those who will be searching your nodes in the future, by Choosing a Good, Descriptive Title.
—Brad
"The important work of moving the world forward does not wait to be done by perfect men." George Eliot
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