Manu Sporny of Digital Bazaar just posted an entirely non-technical video explaining the Semantic Web. The video and all of its source material are available under a CC Attribution-ShareAlike license for sharing and remixing. Quote from the video:
If you can open a web browser, you can understand the Semantic Web.
CC has been using Semantic Web technologies for the machine-readable layer of its licenses from the beginning and we’ve recently migrated much of our server-side infrastructure to these technologies.