This is a preliminary place to look for the new DM2 driver for Linux which I presented on this YouTube video.
The proper place to look for the most recent version is http://sf.net/projects/dm2linux, which contains the newest deb source package and the latest and greatest code in SVN.
And while you wait for us to write a proper project page, don't forget to watch this Cinelerra+DM2 Demo on YouTube. It's a little less well produced and much shorter than the Mixxx video. I still hope you enjoy it!
The (very!) preliminary MIDI control patch for Cinelerra can be downloaded here: http://www.jockusch.de/dm2/cinelerra_midicontrol_1.patch