I thought I would help some people out. I have only been using zbrush for about 3 days but I will share the links and tutorials I have found which helped me out a lot.
First of all there is: www.3dbuzz.com
3dbuzz provides very good basic overviews of the older zbrush, it doesn't really reflect on zbrush v2 but it still has the basic concept. It will help you understand how the program works rather than where everything is at.
NOTE: 3dbuzz requires a star to download video tutorials, its a good thing to have even if your not downloading anything. I'm a suporter of the buzz family and all you need to do is be an active member of the forums and website to obtain that star.
second of all there is: http://www.digital-tutors.com/
Digital tutors is a new website I found which has been growing very fast. As far as I know its very new. Its mainly based for zbrush and maya users. The tutor is very talented and in some ways its better than 3dbuzz. They are practical tutorials rather than just theory like most of 3dbuzz's work. Its a very good zbrush resource and its proberly the best video tutorial provider for the program I have seen so far. I might buy there DVD and see what there photoshop stuff is like. But atm I'm not sure because it does seem very basic. Even zbrush does not go full inscale about how to make an uber l33t model.
third of all: www.pixolator.com
zbrush central is a massive forum, it has some very experiance artist on it and its a good idea to go on the forums. For refresh go on the website and just simpily serch for the word tutorial. You will find many tutorials posted over the past. They where a lot of them that helped me out. Its proberly not a good idea posting every question under the sun because it will just anoy people. Try to be more independant.
Thats about all I know so far. As I said its only been a couple of days. Maybe everyone else can post there favorite zbrush resources. I hope this has helped.
Thanks, hope this helped some people.