BSD Sockets: A Quick And Dirty Primer
http://ftp.std.com/homepages/jimf/sockets.html

An Introduction to Socket Programming
http://www.uwo.ca/its/doc/courses/notes/socket/index.html

UNIX Network Programming
http://www-net.cs.umass.edu/ntu_socket/

Beej's Guide to Network ProgrammingBeej's Guide to Network Programming
http://www.ecst.csuchico.edu/~beej/guide/net/

Spencer's Socket Site
http://www.lowtek.com/sockets/

Introduction to Socket Programming
http://www.linuxgazette.com/issue47/bueno.html

Linux Network Programming
http://www2.linuxjournal.com/lj-issues/issue46/2333.html
http://www2.linuxjournal.com/lj-issues/issue47/2335.html
http://www2.linuxjournal.com/lj-issues/issue48/2336.html

BSD Sockets Programming Tutorial
http://www.ecst.csuchico.edu/~chafey/prog/sockets/sinfo1.html