Autodesk has a Developer training schedule here. More than half the classes listed are free webcasts. If it has already taken place, you can download the presentation from the link in the right hand column.
Update:
Autodesk no longer has the videos from that link. You can download the latest training videos here:
https://aps.autodesk.com/developer/overview/autocad
API Documentation is located here:
https://aps.autodesk.com/developer/documentation