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.
useful for teachers making clips to analyze in class; "personalize any video with your story. With visual spotlights, you can narrate your personal videos, add captions or subtitles, or comment on any scene."
I have not tried it yet but am interested in the arrival of word processing, video editing, and photo editing tools to the web. This one has an intuitive interface.
tips page, also has page with links to other resources; basic info. but many folks have a hard time with the menus on a digital camera and just use it in a point and shoot way