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"2collab is a free online bookmarking tool for professional researchers. Away from the noise of general web applications you can store and easily manage (using tags for added flexibility of categorisation) your links library. You can import your stored references to easily share them with your chosen colleagues or export your library ready for inclusion in your next research paper or project document."

"Easily manage your bookmarks in a banner ad FREE environment. Import/Export, create public pages (password protected if you wish), share bookmarks. All for FREE."

Thanks to Di Wilson for this link - looks good.