You can also browse through the lessons from the following Inventor 2009 courses and watch sample lessons from each course.
Inventor 2009: Solid Modeling
Inventor 2009: Assemblies and Advanced Concepts
Inventor 2009: 2D Drafting and Customization
Inventor 2009: Sheet Metal Design

Assemblies and Advanced Concepts Lessons
(Click highlighted lessons to watch them.)
Introduction
Using and Creating Templates
Creating Derived Parts
Editing Derived Parts
Intro to the Assy Environment
Degrees of Freedom
Driving Constraints
Explicit Reference Vectors
Adaptive Parts and Sketches
Creating Adaptive Parts I
Creating Adaptive Parts II
Assembly Constraint Strategies
Using Constraint Strategies
Removing Adaptivity
Driving Adaptive Assemblies
The Content Center
Mirrored Assemblies
Flexible Assemblies
Copied Assemblies
Pattern Components
Advanced Viewing
Assembly Viewing
Motion Constraints
Animating Gears
Transitional Constraints
Collision Detection
Contact Solver
Checking for Interferences
Creating Compressible Springs
Driving Adaptive Springs
Positional Representations
Creating Presentations
Editing Tweaks
Creating iFeatures
Inserting iFeatures
Creating iFeatures from Parts
Creating iPart Factories
iPart Members
Editing the iPart Author
iMates and iParts
Custom iParts
Creating iPart Assemblies
Updating iParts
Creating iAssemblies
Threaded iParts
iMates and the Content Center
Identifying and Using iMate Glyphs
Inferred iMates
Scaling Parts
Combining Parts I
Combining Parts II
Subtracting and Splitting Parts
Deleting Faces
Strategy for Splitting Parts
Trick for Measuring Interferences
Prep for Design Accelerator
Bolted Connections
Generating Bearings
Generating Shafts Part I
Generating Shafts Part II
Generating Shafts Part III
Generating Gears
Generating Keyways
Parameter Driven Assemblies
Thinking Outside the Box
Advanced Spring Design
Animating Complex Assemblies I
Animating Complex Assemblies II
Inventor Studio Lighting I
Inventor Studio Lighting II
Inventor Studio Animations I
Inventor Studio Animations II
Conclusion