
My students say that vodcasts are used most heavily at exam time. They work as a remedial tool (may be especially good for disability and ESL students). And the videos are great for those who miss class but want to catch up before the next one (though average attendance at lectures is in excess of 80%--in evening classes of 450 people, tracked using iclickers).
The only real issue that has emerged occurs when students try to play the vodcasts wirelessly. Then the playback sometimes hiccups, making notetaking frustrating. To fix the issue, the vodcasts could be downloadable, and/or the students need to be plugged into a network for faster and more stable connectivity.
Other issues to ponder for those considering podcasting include the production costs in terms of equipment purchase or rental (camera, tripod, mic, DV capture deck, tapes, computer, software), and personnel costs (camera, editing--in my case I hired undergraduate videographers and professionals from Queen's ITS Video Multimedia Production).
Other factors being discussed and debated include the political and personal issues regarding a perceived or real loss of control over lecture material and intellectual property--in which case there is always Creative Commons Licensing. And then there is the personal issue of one's comfort with being recorded, filmed, downloaded, and publicly distributed outside the walls, halls, and towers of the campus.
I have been blogging about "professors on podcasts" and related trends in digital popular culture in the mainstream news media.
Update: I just posted David Harpp's paper (see comments below) in the eLearning links section.
Update: I just posted David Harpp's paper (see comments below) in the eLearning links section.