I learned inventor from theses three sites as well as just playing around
http://students4.autodesk.com/?nd=m_learning_detail&product_type_id=3&return_nd= m_learning&training_course_id=55,
http://usa.autodesk.com/adsk/servlet...linkID=9242016 and,
http://students6.autodesk.com/?nd=inventor_demos. Their good tutorials they have skill levels for basic to advanced. But it is my suggestion to play around with inventor on your own for a little bit then you will have an essayer time going through the tutorials because you will have some idea how things work in inventor. It also gives you a chance to learn what some of the tools are and what theses tools do. The third link has some good videos to start you off some of their topics are advanced but they do allot of simple steps to accomplish the larger picture. I have also found that inventor has a learning curve but once you get the inventor mindset every thing you learned comes together and you understand every thing allot better. So stick with it.
One site you might need a password but i am not sure.
Matthew Simpson
Team 75 Driver