Zotero, a free research extension for Firefox, just released its release candidate 1. I have been using it in all of the beta stages. It is a great tool that really helps build a bibliography in any output style you want. I used it with Ebscohost and other online libraries. It allowed me to easily build my bibliography for a NIH grant and exported it to Word 2003 in APA style. If I only would have used this great tool for my dissertation...
To learn more, look here:
http://www.zotero.org/documentation/changelog