Also there is this... http://www.fileplanet.com/dl.aspx?/planetquake/polycount/tutorials/video/zbrush2_max7.zip The practical guide is what I used to learn it, but the above tutorial is all in real time with audio to guide you. I go over all the tools I use anyway.
Zbrush 2 Practical Guide Read & follow the tutorials on this pdf. They helped me a great deal in grasping Zbrush's weird interface. Once you get into it though, you'll learn to love/hate it just like any other good app. Good Luck!