You can use the Adobe Creative Suite 3 Video Workshop to start learning about any application you're interested in, whether you own it or not. The Video Workshop shares expertise from across Adobe and the Adobe community--you'll learn tasks, tips, and tricks from leading designers, developers, and Adobe experts. There are introductory videos for new users, and more experienced users can find videos on new features and key techniques.
This is our renewed screencast resource. We discuss software, techniques and technologies and offer suggestions and tutorials to create the best onscreen demonstrations. We also have a useful resource directory that hopefully may direct you towards the best screencast stuff online.