This report summarises a workshop organised as a part of the EU-funded TrebleCLEF project entitled "Query Log Analysis: From Research to Best Practice" held on 27-28th May 2009 at the British Computer Science Offices in London, UK. The event involved 12 invited speakers from various academic and commercial institutions from around the world who are all involved, in some way, with query log analysis. A number of other people attended the event including local businesses and academic institutions. The workshop provided a forum in which to discuss and share experiences and best practices regarding query log analysis. This report describes the event and the presentations given by the invited speakers, and it summarises discussions held.