The DCC recently released a new guide on How to Track the Impact of Research Data with Metrics by Alex Ball and Monica Duke.
"The guide will help you to track and measure the impact of research data, whether your own or that of your department/institution. It provides an overview of the key impact measurement concepts and the services and tools available for measuring impact. After discussing some of the current issues and challenges, it provides some tips on increasing the impact of your own data. This guide should interest researchers and principal investigators working on data-led research, administrators working with research quality assessment submissions, librarians and others helping to track the impact of data within institutions."
It is available for free on the web pages or to download as a pdf. Paper copies can be ordered from the DCC online shop.