I don't really use it anymore (replaced it with Zotero) and don't
have time to maintain it, but it is still being developed upstream
(as of late 2011):
http://sourceforge.net/projects/bibus-biblio/
There is a 1.5.2 release available, see also:
https://bugzilla.redhat.com/show_bug.cgi?id=757675
Hopefully it will go to a better home.
Alex