Flowblade - a new video editor using MLT that he has quietly been working on since 2009!
It is written in Python and GTK+ and is released under the GPLv3 license. Flowblade employs a "film style" or "insert editing" paradigm, maybe best known from Avid products. Therefore, its UI and workflow is quite a bit different than OpenShot.
You can see a screencast video of it in action on Vimeo: http://vimeo.com/40929683