Zotero is a new reference management tool that comes in the form of a Firefox (and Flock) extension. It looks like it could be a very good (and free) alternative to commercial reference management software tools like Endnote and Reference Manager. It even has plugins for Word and OpenOffice for cite-while-you-write functionality, and Wordpress so that writers of Wordpress based blogs can ensure that their posts are cleanly imported for users of Zotero.
Zotero [zoh-TAIR-oh] is a free, easy-to-use Firefox extension to help you collect, manage, and cite your research sources. It lives right where you do your work - in the web browser itself.
If you have any potential use for reference management (i.e. if you are a student or scientist) - I seriously recommend checking this out.