Tools for 3D Designers
blog.limeexchange.com
blog.limeexchange.com
Zbrush has http://www.pixologic.com/zclassroom/, http://simply3dworld.com/ is an umberella site that caters for Maya, Lightwave and Max.
The problem with offering a complete training solution for 3D as a general subject is that much that is learned from one app can be rendered all but redundant by another, such is the difference in interface, overall function and language used in each. This is why there's a certain level of specialisation when it comes to sites that offer training. Each app requires a high degree of focus and commitment to become proficient.
It would simplify the process and workflow immeasurably, and results would be instant as you're constructing everything in realtime directly within the environment.