"The result of a two-year collaboration of the MIT Libraries and Hewlett-Packard, DSpace is built on open-source software and is available to anyone free of charge. But it’s even more important to note that many believe this groundbreaking effort will fundamentally change the way scholars disseminate their research findings."
"The $1.8 million project became part of the five-year, $25 million MIT-HP Alliance, a research effort to develop digital information systems. In the spring of 2000, the project team of HP software developers, MIT administrators, and a faculty advisory committee started to develop the system."
They're using Lucene. Wouldn't it be nice to do Lucene and RDF searching at the same time? It's good to see you can download DSpace from Sourceforge.