Screencast is the digital recording of a computer screen output, often including audio. 

Here are some examples of screencasts at Middlebury:

Google Reader – Alex Chapin
This is a screencast of an LIS presentation I did last spring using Snapz Pro

LISterine Workshop screencasts

A number of LISterine Workshops have been captured using Accordant,  See:
Getting to Know Drupal – Ian McBride
Entering the World of Mashups – Jack Cuneo and Jue Yang