Mark Birbeck and I presented our recent work, sponsored by the NIC, on building a semantic web platform for health data, at Semtech London 2011.
Since it's inception as a re-usable toolkit fed from the work we have been doing with the NHS National Innovation Centre, the Linked Data Platform has evolved. The core functionality is still focussed on taking data from spreadsheets and other structured sources (including SPARQL endpoints) and then visualising this data within a Drupal-based UI.
We've been using XLWrap as a tool to take data from spreadsheets and turn it into RDF triples. At the time we started using XLWrap, there was no alternative that would enable us to generate multiple triples from one cell in a spreadsheet (we'll explain why this is important later), and there was also no Google Refine.