A bunch of us started a weekly chat night for Zbrush on Tuesday nights so we can talk and ask questions about Zbrush.
It is on sorcery.net and in the #zbrush chat room.
I have done this with another program and it is one of the best ways to learn about zbrush.
I plan on going there around 8:00 8:30 EST if anyone would like to show up and talk about 1.5