Zotero (pronounced "zoh-TAIR-oh") is a Firefox addon that collects, manages, and cites research sources. It's easy to use, lives in your web browser where you do your work, and best of all it's free. Zotero allows you to attach PDFs, notes and images to your citations, organize them into collections for different projects, and create bibliographies using Word or OpenOffice. It is easier to use than RefWorks and surprisingly powerful.
Since it's a Firefox plugin, it automatically updates itself periodically to work with new online sources and new bibliographic styles.
Using This Guide
This guide is several pages long -- use the tabs across the top to navigate through topics, or the "Print Entire Guide" link in the bottom right to print the whole thing.
Zotero Quick Start Guide