Videos are boring and why Codecademy Everyone
hackingeducation.posterous.com
hackingeducation.posterous.com
More to the topic I personally feel that more important than the choice of video or interactive exercise as the teaching medium is the individual's motivation to learn. Without that it's easy to fall asleep, metaphorically speaking, and with it, things like pausing, rewinding etc. isn't a problem at all. The training material simply has to open a few conceptual doors, and the rest naturally follows.