I made this tutorial some time last year. I made about 3 chapters, they each contain about 3 pages each. If you like this... I might consider starting it again. http://wuensche.ca/StuffTutorialsPart1.pdf I didn't put the other parts in to PDF format yet, but what do you think?
That's really hard when you're pitching your information down at that level. How much do you try to explain and how much do you just demonstrate. I guess the big thing is why you are doing it... the information is available elsewhere (eg phpbuilder.com) so it's not unique. If you are doing it to build your credibility as a programmer then consider writing tutorials for the more experienced coder as you'll be able to show your flair more easily. If you are doing it to showcase your technical writing skills then this level is probably fine.