Udell (uber guru) writes about screencasting:
I’m now using screencasts — that is, narrated movies of software in action — to showcase application tips, capture and publish product demonstrations, and even make short documentaries. And I’m seeing others around the Net starting to do the same. Now’s a good time to explain why I think this mode of communication matters and will flourish.Experts use software far more effectively than novices. This knowledge is very rarely communicated in manuals; only a few books are good at providing this information. Sharing brief task-based usage is a valuable tool for building effective users.