Zotero is a Firefox extension designed for collecting, managing, and citing research sources.
It's different from commercial citation tools like EndNote, BibTex, RefWorks, etc., in that it works from directly within the browser itself. And it's free. But you have to use it with the Firefox browser.
A review of Zotero can be found in this blog, maintained by reference librarians at Duke University (USA). If you have time, check out this webcast dedicated to Zotero at 2:00 PM EST on Thursday, January 10, 2008.
This is me, making a comment on my own blog! But as a PS, I finally had the opportunity to use Zotero, when I was collecting citations for an article I want to write. It's pretty intuitive, and I hardly had to spend any time at all learning my way around it.
Posted by: jessicaM | 18 September 2008 at 11:23 AM