If you are interested in the semantic web and linked data, data.ac.uk looks like a site worth investigating.

“This is a landmark site for academia providing a single point of contact for linked open data development. It not only provides access to the know-how and tools to discuss and create linked data and data aggregation sites, but also enables access to, and the creation of, large aggregated data sets providing powerful and flexible collections of information. Here at Data.ac.uk we’re working to inform national standards and assist in the development of national data aggregation subdomains.”