JISC has released the Digital Repository infoKit, which was created in association with the Repository Support Project.
Here's an excerpt from the press release:
The Digital Repository infoKit is a practical 'how to' guide to setting up and running digital repositories. The kit contains information on a broad range of topics running from the initial idea of a digital repository and the planning process, via detailed sections on repository set up and promotion, through to the maintenance and ongoing management of the repository. The main focus is on institutional repositories and the kit reflects current repository community best practice. This resource has been written for repository administrators. It assumes no prior knowledge of repository matters and, more importantly, assumes no prior technical knowledge. The kit can be used by anyone who needs an introduction to any of the topics covered.