I am not sure which tutorial you are reffering to, but most of the pIllusion tutorials can be found at the pIllusion website. Just click on the particleIllusion logo (Not the wondertouch logo - that takes you to the main page)at the top and it will send you on your way. Here's the direct link, in case you can't see the picture:
Thanks Aharon, I went there already and found the tutorials, but not the one I want. It was an html file that went through all the basics and not really specifics, it was the manual for PI, that's the one I can't find.