It is widely acknowledged that a common knowledge base for European research is necessary. Research repositories are an important innovation to the scientific information infrastructure. In 2006, digital repositories in the 27 countries of the European were surveyed, covering 114 repositories from 17 European countries. In follow-up, this book presents the results of the 2008 survey. It shows an increasing number of respondents, but also a further diversification in the character of a repository. Repositories may be institutional or thematically based, and as such non-institutional as well....