Semantic Web Case Studies

I read The Semantic Web In Action Scientific American article Prof. Chen recommended to us. I've been particularly interested to learn more about whether and how businesses are benefiting from the semantic web and/or semantic integration efforts. I want to point out that the article cites the W3C Semantic Web Education and Outreach Interest Group which has compiled a number of case studies and use cases. It will take some time to go through the case studies in detail, but they clearly represent a valuable resource for understanding what about the semantic web is working and what challenges remain.