I always want to try and write great tutorials but damn I'm wordy. I'm aiming to write the defacto papers on PHP Socket Programming however I'm 8 pages in already and all I have is a basic socket server implemented :)
Anyway, here is a link to Part I on my socket programming tutorial. This page is really aimed at getting you up to speed on what socket programming is all about and what all the commands refer to and what the parameters they take are geared to do. I'm planning on adding a section a week so we'll see how that goes.