Here are some active communities engaged in video editing. These are mainly forums and discussion board where you can discuss about video. Most of these users should be interested in migrating to Kdenlive. So do not hesitate to advocate Kdenlive on those web sites.
XML effect file documentation ?
XML Format and Edl's
XML support Blender
Xperia Tablet S Codec-Copy 3D Blu-ray/DVD/Video to Sony Xperia Tablet S
Xvid4 only render over 33 min in the final video
yet another crash on openening a project
Yoo Hoo - Anybody Out There??
you miss SDL libraries support in MLT, Help
You should really advertise the wonderful new "Colgate" "LMS white balance" filter...