We started with a talk by the current org maintainer Bastien. I think the most promising feature he is working on is org-bot. It's a way for someone to manipulate somebody else org file via ERC. I think it's quite exciting: this may lead the way for org to become multi user.
I gave a short talk in the beginning of the afternoon on how I implement GTD with org. We then split up in small group. Isabelle, Thierry and Vincent-Xavier took care of translating the reference card in french. I heard that Bastien and Julien specified how to implement numbered lists. Kaze, Kinouchou and others were working on usage and workflow. I showed Bernard, Mohamed and Vivien how fun it was to program in elisp.
We then went to a restaurant and had a good time. I think everyone involved felt that their time was put to good use. I hope we will do this again.