A report actioned by the European Commission, and carried out by the United Nations University has concluded that Open Source Software is key to competitiveness. The report highlights the advantages that Open Source Software can provide to SME’s.
It also reports that by 2010, 32% of all IT related services will relate to Open Source activities and this will contribute 4% of European GDP.
This is a long document, but makes interesting reading
http://ec.europa.eu/enterprise/ict/policy/doc/2006-11-20-flossimpact.pdf