There’s a collection of three short videos up at Dotsub.com which explain what RSS, wikis, and social networking are and how they work using a whiteboard, pieces of paper, and a voiceover. They’re great fun to watch – short (2-4 minutes each), very easy to understand and just plain cute.
(Dotsub.com is a small video sharing site, a little like YouTube but if you supply English subtitles, your viewers can translate them into their own language which is then available to future viewers — check out the list of languages available on the RSS video, all user-created.)