Here are some great videos to watch because a) they use plain English and b) I love the clean presentation style. They cover some of the new Web 2.0 tools that have really enhanced the way people use the internet in the last few years.

Social Bookmarking in Plain English

Podcasting in Plain English

RSS in Plain English

You can find all their videos, covering Twitter, Social Networking, Photo Sharing and, erm.. Zombies on YouTube here. Or go to the CommonCraft site to download high res versions to use elsewhere.