All About Sockets
Features online lesson about socket, sample code and how to write a client/server pair.
Network Functions in C
Offers inside information on socket, port binding, accepting and closing connection and other tutorial topics.
Spencer's Socket Site
Offers inside information on articles, FAQs on Unix sockets, sample source and tutorials.
Unix Socket FAQs
Features discussion on socket programming in Unix, site features basic info, concepts and more advance topics.
Winsock Programmer's FAQ
Features information about Winsock, including general information, issues for programmers, examples, resources and articles.