DaveNeary is working on this.
Proposal of papers database
What if GUADEC'2006 call for papers starts conforming a (public?) database of possible talks, presentations, BOFs, debates, showcases... People presenting these papers will be happy of being accepted to have time&space in GUADEC's official program, of course. But perhaps they would be also happy if we help them being invited to other events.
This Live Presentations Management Tool (LPMT) 
could help also other GNOME and nonGNOME events finding the best speakers & sessions our community is able to deliver. Hence this would ease the fact that not-the-usual-suspects GNOME people will speak in conferences, acquiring more experience doing this and becoming new-usual-suspects for the good of the whole GNOME project.
More: http://mail.gnome.org/archives/guadec-list/2005-December/msg00055.html
We got interesting feedback:
Use the CERN agenda system. This is widely used in Physics conferences everywhere. http://agenda.cern.ch/List.php It has been very thoroughly tested. Check it out! Martin Sevior