The Institute for Volunteering Research (IVR) has recently published a research bulletin Volunteering and employment: What is the link for unemployed volunteers? exploring the link between volunteering and employment for unemployed volunteers. The bulletin explores the lack of hard evidence for job outcomes as a result of volunteering, but goes on to discuss the wide range of employability-related and non-employability-related benefits that those out of work can gain from volunteering. You can find the bulletin on the IVR website.