On the 17th of February 2011, one of the ReactOS developers, Pierre Schweitzer presented the ReactOS project (reactos.org) at the ISIMA (isima.fr).
The first part of the presentation was covering the history of the project and a global approach of what the project is. After that, a live ReactOS demonstration was done.
Finally, a more technical speach about how file systems drivers work in ReactOS was performed.
You may find the PDFs used for the presentation on the ReactOS press-media SVN repository.
Due to technical reasons even if the presentation lasted 1h30, only those 20 minutes are available.
This was shot by the ISIMA association Koncept.