Lee Lefever of CommonCraft has posted video in which he explains "what is RSS" with stick figures and an entertaining style. It's been getting lots of play today, so you've probably seen several references to it already. Video: RSS in Plain English. The short form: RSS helps you turn around the arrows.
We made this video for our friends (and yours) that haven't yet felt the power of our friend the RSS reader. We want to convert people... if you know someone who would love RSS and hasn't yet tried it, point them here for 3.5 minutes of RSS in Plain English.
The video has also been posted to YouTube, which adds the important contextual "related" videos. The only one that comes close is sagerock's A Friday Commentary on RSS, but it felt more like someone ranting about it than about what it is. And, of course, there are plenty of videos that are not related. But that's the fun of YouTube.