Check out THIS primer on the Semantic Web by Atul Kedar of Avenue A | Razorfish. It is a good primer on semantic technology, micro formatting, and RDF tagging.
Unfortunately, too many in the market have still not recognized the importance or promise of Semantic web. However, there are signs that this is changing. Reuters and BBC are doggedly pursuing the technology as OpenCalais indicates.
Even more exciting (to me) was a recent visit I took to a very large customer. They were very interested in the ability of leveraging semantically tagged assets to dynamically assemble them according to published a published ontology. We are talking hundreds of thousands of assets that "go together" in certain ways to produce a unique whole.
This is exciting because it goes beyond the "boosted search" promise that much of the semantic web value pitches are stuck in. Instead it goes to the heart of relational but unstructured data and using the relationships to govern the self-assembly of discreet, semantically tagged assets.
