Some time ago Pentax launched "Izumi Taniguchi Digiichi Seminar" on:
http://digiichi.pentax.jp/english/tech/
There are a lot of tips and some kind of tutorial for using PPL and Pentax Digital Cameras.
Izumi Taniguchi describes how to create your own workflow and how to take advantage of digital technology in photography.
UPDATE:
Unfortunately now this tutorial is unavailable, but if you have any problems, please post in this forum.