My GVSU colleague Mandy Calvillo has developed a fantastic resource for students and instructors using Active Prelude: a YouTube library of 122 (!) short videos that offer additional perspective and explanation on key ideas in the text. The videos are numbered and labeled in alignment with the sections of the text. This is a wonderful complement to the libraries for chapters 1-4 and 5-8 of Active Calculus (single variable), and something I know will benefit students and instructors alike.
Thank you very much!!
Gord