I was reading a case study about Camtasia's implementation in IBM. I can appreciate the use of multimedia in eLearning because of its effectivity. I read in a book that more people can absorb a certain lesson if it was presented with both audio and video. I myself is a visual person and I would prefer watching a presentation than reading a book about it.
The best thing about captured presentation is that it doesn't lose its meaning. I mean if I would tell a story to a friend of mine and he will in turn tell it to others, once it passes through 3 or 4 persons, you would be amazed how different the story becomes.
Using a captured presentation, just share the link to each of your friend and they will hear the material exactly the same as how you heard it.
More info about camtasia studio screen recorder here.