Mendeley is a PDF and citation manager that indexes and organizes your research library into a digital bibliography. The program includes a collaboration component that allows you to share citations with other researchers. Mendeley is both a desktop application and a web-based application.  

To begin, click the "join this group" button on the Stanford Mendeley Group page. The Stanford Mendeley Group account offers students, faculty, staff and researchers 7 GB of storage and the ability to create up to 10 private groups.

Documentation and tutorials: