I think that it is a great idea for teachers to use podcast in their teachings. If a student is sick or absent for any other reason having a podcast lesson also when be extremely helpful. It can also be a good device for in class students. Some students can benefit greatly by being able to listen to their class lesson outside of that class. They will grasp concepts better. I know I would. I could take notes from class and go back and listen to my instructor, and write some things that I missed. Podcast is a wonderful tool!!
