Maybe many people find video tutorials to be more cleared and easier to follow than text based (web/pdf) tutorials, you can just sit back and watch them over and over again, for lazy guys to read like me it would be much more preferred way
This topic would be to collect any publicly available video tutorials for 3d editing, yeah they most likely arent for O2, but the general knowledge of modeling is still there and very important in O2 also. If you are good modeler, you can use O2 easily to create content.
Video Tutorials:
Modeling the Temple by Giorgio Luciano, Italy. Made in 3DS Max.