This site contains over five hours of tutorial movies, created over eight editions of the book, that demonstrate some of the techniques in the tutorials. Sometimes, it's easier to see how something works than to read about it.
While many of the movies have been created with recent versions of Photoshop, some date back ten years or more. If the techniques they portray still work, I've left them alone. It's interesting to see how the Photoshop interface has changed over the years - and to see how many approaches are still as valid as they were a decade ago.
Click on any chapter name to go to the page containing the movies for that chapter.