Making a Semantic Web by Joshua Allen:

If you've paid any attention to the web standards discussions, you may have heard the phrase "Semantic Web", or perhaps even been pressured to use standards with names like "Dublin Core Metadata" or "RDF". If you've attempted to read any of the available documentation on these topics, you were probably intimidated by terms such as "reify" and all sorts of artificial intelligence concepts. This document attempts to explain what all of this chatter really means, and help you decide which parts you should care about and why. I have tried to use common-sense, real-world examples and stay away from complicated terminology.

Talking of the Semantic Web:

Facilities to put machine-understandable data on the Web are becoming a high priority for many communities. The Web can reach its full potential only if it becomes a place where data can be shared and processed by automated tools as well as by people. For the Web to scale, tomorrow's programs must be able to share and process data even when these programs have been designed totally independently. The Semantic Web is a vision: the idea of having data on the web defined and linked in a way that it can be used by machines not just for display purposes, but for automation, integration and reuse of data across various applications.

The Semantic Web Activity is a successor to the W3C Metadata Activity.