The team of Gerd Stumme(a former AIFB researcher and now professor at the university of Kassel) created BibSonomy:
our social bookmarking system BibSonomy is now online, and some of you are already using ist. We would like to invite you all to join us in sharing and organizing bibtex data. BibSonomy is intended to support everyone, but in particular researchers, to share bookmarks and bibliographies. One main reason for setting up the system is that we have to deal with bibliographic data all the time, and needed a more coherent way to manage our bibtex data.