Zotero <www.zotero.org> is a powerful, easy-to-use research tool that helps you gather, organize, and analyze sources and then share the results of your research from within your Firefox browser.
Easily download citations for books, journals, articles
Create bibliographies
Instantly formats citations according to your needs
Searches all Zotero documentation word-for-word, including PDF files
Download images
Capture screenshots
Compatabile with Microsoft Word
Zotero quickstart guide
http://www.zotero.org/support/quick_start_guide
Zotero documentation
http://www.zotero.org/support/
Helpful screencast tutorials & overview
http://www.zotero.org/support/screencast_tutorials
University of Michigan Zotero tutorial
http://www.lib.umich.edu/files/services/exploratory/pdfs/zotero.pdf
Download Firefox browser
http://www.mozilla.com/
Firefox add-ons
https://addons.mozilla.org/