Richard Harrington was recently interviewed by Mac Edition Radio about Photoshop and education.
"An interview with Peachpit Press Author Richard Harrington on writing a book to help teach Photoshop. Rich brings years of teaching experience, expertise with motion graphics, and a longing for the perfect book to teach Photoshop with, and wrote “Understanding Adobe Photoshop: Digital Image Concepts and Techniques.” Recorded at the National Association of Photoshop Professionals Photoshop World Conference, Las Vegas, in September 2006 by Harris Fogel."
Have a listen if you'd like.