A sophisticated reference manager with online and desktop components, Mendeley allows you to organise your saved papers, annotate pdfs, collaborate in open or private groups, and connect with other researchers in your field. Use the Web Importer to search for references and save them quickly into your research library. Mendeley will create fully formatted reference lists in hundreds of citation styles.
Mendeley is free!
Mendeley provide a range of video tutorials and guides to help you with importing and organising your references.