Great to hear you are looking at learning Autodesk Inventor. The list provided by others is good, particularly the new Built by Design videos.
In addition there are tutorials created by myself on the Autodesk FIRST student community page. Lots of exercises and a series of videos built around a FIRST robot part. For example, here is a link to the project file tutorial.
http://students.autodesk.com/ama/ori...oject_File.swf
Let me know if you have any questions.