Shared bookmarking

Connotea is a free website to help researchers manage and share information. It allows you to save links to all your favourite articles, references, websites and other online resources with one click. While you can bookmark anything on the web with Connotea, it is primarily intended to allow you to save links to references so it offers special functionality for bookmarking academic papers and books. Because it is web-based you can access it from anywhere in the world, and you can save articles with one click, without interrupting what you are doing and without needing to re-type the bibliographic information. It is compatible with Endnote and Reference Manager, allowing you to easily export references to those programs.

Connotea is also a social bookmarking tool, so you can view other people's collections to discover new, interesting content.

Try it for yourself here:
http://www.connotea.org/