CiteULike is a social bookmarking citation service geared towards academics that allows you to easily share, store and organize references to books, academic papers and other resources right from within your browser.
CiteULike allows you to add references as you are viewing them. When you add a reference from a supported database, CiteULike automatically extracts its citation information. CiteULike works in conjunction with the Harvard LibX Firefox extension to display Find It @ Harvard buttons next to references. This allows you to quickly locate the item in full-text or in print in a Harvard library. CiteULike references can be exported to BibTeX and Endnote. CiteULike is free and contains no advertising. See the CiteULike FAQ for more information. Registration required.