Autodesk has posted their Masterclasses from 2009 for free over at The Area. Just sign up (it’s free) and enjoy some tips and tricks from real masters of Autodesk softwares; including 3ds max, Maya, Mudbox, Softimage (nope, it is not called XSI any more), Motion Builder and mental ray. Here is the link; http://area.autodesk.com/masterclasses.
I personally find these two classes to be very interesting, in 3ds max:
Non-Photorealistic Rendering Techniques in Autodesk® 3ds Max® with Gary M. Davis
Giant Robots: Using mental ray shaders to integrate CG elements into real shots with Håkan “Master Zap” Andersson (Swedish guy! )
And I think I have a look at this one as well, its in Maya:
Fracture: procedural, collision event-driven destruction with Kevin Mannens (I do like destruction )
I’ll have a look at the Mudbox class as well if I got the time.