FAQs, Help, and Tutorials

Introduction to network functions in C
A basic tutorial showing how to write simple socket servers. Source code, glossary and examples are also available.
http://shoe.bocks.com/net/

An Introduction to Sockets in C Through Annotated Examples
An introduction by example about sockets with the C programming language.
http://www.math.grinnell.edu/~walker/c/sockets-index.html

Spencer's Socket Site
About network programming with sockets under Unix and Windows. Tutorials and links to other FAQs, tutorials, and sample code.
http://www.lowtek.com/sockets/

UNIX Socket FAQ
Frequently asked questions with answers about programming with sockets in UNIX environments. By Vic Metcalfe.
http://www.developerweb.net/forum/forumdisplay.php?f=70

Winsock Programmer's FAQ
Frequently asked questions with answers for WinSock programmers. By Warren Young.
http://tangentsoft.net/wskfaq/