In 2006-7 I taught the module using my tablet PC and made annotated slides available after the lectures. I also recorded the audio from each lecture, but not screencasts: I only started screencasting this academic year.
In 2007-8 I tried an experiment where I used the 2006-7 materials. Instead of standard lectures, I told students to read the annotated slides and listen to audio from 2006-7 up to a certain point, and we then met for question and answer sessions/tutorials/workshops instead.
I found that this worked a bit better for the small fourth year classs than a similar experiment did for a larger third year class.