The BBC has put a significant amount of their World Service Radio broadcasts on a website. This website is partly a project, partly a case study and partly a working online digital repository with public access.
From their descriptions: “this prototype website includes over 50,000 English-language radio programmes from the BBC World Service radio archive spanning the past 45 years, which have all been categorised by a machine. You can explore the archive, listen to the programmes and help improve it by validating and adding tags.”
The project has included automatic speech recognition to generate metadata (tags) and is also experimenting with public tagging of content. As a case study, it shows what can be accomplished with a relatively small amount of labour — though the labour came from a group of people who were highly-skilled in computer processing of digital media, website generation and semantic technology.