JISC CETIS has released "The Semantic Web, Linked and Open Data: A Briefing Paper."
Here's an excerpt:
This briefing paper will provide a high level overview of key concepts relating to the Semantic Web, semantic technologies, linked and open data; along with references to relevant examples and standards. The briefing is intended to provide a starting point for those within the teaching and learning community who may have come across the concept of semantic technologies and the Semantic Web but who do not regard themselves as experts and wish to learn more. The examples and links are intended as starting points for further exploration.