how-to videos or, more commonly, audio/slideshows; useful rhetorically for both technical writing and instructional video learning; web2.0 sharing of video that is perhaps instructionally more useful than YouTube.
F. Decortis, A. Rizzo, and B. Saudelli. Interacting with Computers, 15 (6):
801 - 830(2003)From Computer Artefact to Instrument for Mediated Activity .Part 2 Learning Environments.